possible deadlock in pipe_lock
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syzbot
Apr 14, 2019, 4:51:37 AM4/14/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=143fe6df200000
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=40690beda1a2266cd4b2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+40690b...@syzkaller.appspotmail.com
audit: type=1400 audit(1553227415.630:460): avc: denied { create } for
pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
======================================================
[ INFO: possible circular locking dependency detected ]
4.4.174+ #4 Not tainted
-------------------------------------------------------
syz-executor.2/14953 is trying to acquire lock:
(&pipe->mutex/1){+.+.+.}, at: [<ffffffff814af8b3>] pipe_lock_nested
fs/pipe.c:65 [inline]
(&pipe->mutex/1){+.+.+.}, at: [<ffffffff814af8b3>] pipe_lock+0x63/0x80
fs/pipe.c:73
but task is already holding lock:
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] file_start_write
include/linux/fs.h:2543 [inline]
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] do_splice
fs/splice.c:1403 [inline]
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SYSC_splice
fs/splice.c:1707 [inline]
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SyS_splice+0xf2d/0x13a0
fs/splice.c:1690
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8149ea2f>] percpu_down_read
include/linux/percpu-rwsem.h:26 [inline]
[<ffffffff8149ea2f>] __sb_start_write+0x1af/0x310 fs/super.c:1239
[<ffffffff816c3af4>] sb_start_write include/linux/fs.h:1517 [inline]
[<ffffffff816c3af4>] ext4_run_li_request fs/ext4/super.c:2685
[inline]
[<ffffffff816c3af4>] ext4_lazyinit_thread fs/ext4/super.c:2784
[inline]
[<ffffffff816c3af4>] ext4_lazyinit_thread+0x1e4/0x7b0
fs/ext4/super.c:2760
[<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
[<ffffffff82718fc5>] ret_from_fork+0x55/0x80
arch/x86/entry/entry_64.S:537
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
audit: type=1400 audit(1553227415.800:461): avc: denied { write } for
pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff816cdacd>] ext4_register_li_request+0x2fd/0x7d0
fs/ext4/super.c:2972
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[ 436.857403] audit: type=1400 audit(1553227415.890:462): avc:
denied { write } for pid=14934 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff816cd859>] ext4_register_li_request+0x89/0x7d0
fs/ext4/super.c:2945
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff827139a2>] down_read+0x42/0x60 kernel/locking/rwsem.c:22
[<ffffffff814a1411>] iterate_supers+0xe1/0x250 fs/super.c:547
[<ffffffff819b19f7>] selinux_complete_init+0x2f/0x31
security/selinux/hooks.c:6154
[<ffffffff819a353d>] security_load_policy+0x69d/0x9c0
security/selinux/ss/services.c:2060
[<ffffffff81979e55>] sel_write_load+0x175/0xf90
security/selinux/selinuxfs.c:535
[<ffffffff81496916>] __vfs_write+0x116/0x3d0 fs/read_write.c:491
[<ffffffff81498612>] vfs_write+0x182/0x4e0 fs/read_write.c:540
[<ffffffff8149ac4c>] SYSC_write fs/read_write.c:587 [inline]
[<ffffffff8149ac4c>] SyS_write+0xdc/0x1c0 fs/read_write.c:579
[ 436.986766] audit: type=1400 audit(1553227416.030:463): avc:
denied { read } for pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff81977a39>] sel_commit_bools_write+0x89/0x260
security/selinux/selinuxfs.c:1142
[<ffffffff81496916>] __vfs_write+0x116/0x3d0 fs/read_write.c:491
[<ffffffff81496ce2>] __kernel_write+0x112/0x370 fs/read_write.c:513
[<ffffffff81532e6d>] write_pipe_buf+0x15d/0x1f0 fs/splice.c:1074
[<ffffffff81533b6e>] splice_from_pipe_feed fs/splice.c:776 [inline]
[<ffffffff81533b6e>] __splice_from_pipe+0x37e/0x7a0 fs/splice.c:901
[<ffffffff81536be8>] splice_from_pipe+0x108/0x170 fs/splice.c:936
[<ffffffff81536cdc>] default_file_splice_write+0x3c/0x80
fs/splice.c:1086
[<ffffffff81537d31>] do_splice_from fs/splice.c:1128 [inline]
[<ffffffff81537d31>] do_splice fs/splice.c:1404 [inline]
[<ffffffff81537d31>] SYSC_splice fs/splice.c:1707 [inline]
[<ffffffff81537d31>] SyS_splice+0xd71/0x13a0 fs/splice.c:1690
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853
[inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958
[inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144
[inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
audit: type=1400 audit(1553227416.140:464): avc: denied { read } for
pid=14934 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff814af8b3>] pipe_lock_nested fs/pipe.c:65 [inline]
[<ffffffff814af8b3>] pipe_lock+0x63/0x80 fs/pipe.c:73
[<ffffffff815342e9>] iter_file_splice_write+0x179/0xb30
fs/splice.c:974
[<ffffffff81537d31>] do_splice_from fs/splice.c:1128 [inline]
[<ffffffff81537d31>] do_splice fs/splice.c:1404 [inline]
[<ffffffff81537d31>] SYSC_splice fs/splice.c:1707 [inline]
[<ffffffff81537d31>] SyS_splice+0xd71/0x13a0 fs/splice.c:1690
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
other info that might help us debug this:
Chain exists of:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_writers#4);
lock(&eli->li_list_mtx);
lock(sb_writers#4);
lock(&pipe->mutex/1);
*** DEADLOCK ***
1 lock held by syz-executor.2/14953:
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] file_start_write
include/linux/fs.h:2543 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] do_splice
fs/splice.c:1403 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SYSC_splice
fs/splice.c:1707 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>]
SyS_splice+0xf2d/0x13a0 fs/splice.c:1690
stack backtrace:
CPU: 0 PID: 14953 Comm: syz-executor.2 Not tainted 4.4.174+ #4
0000000000000000 18d547d6cf8cc394 ffff8801bde978b0 ffffffff81aad1a1
ffffffff84057a80 ffff8800b4e997c0 ffffffff83abd2b0 ffffffff83abc380
ffffffff83ac8080 ffff8801bde97900 ffffffff813abcda ffffffff83e1f600
Call Trace:
[<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<ffffffff813abcda>] print_circular_bug.cold+0x2f7/0x44e
kernel/locking/lockdep.c:1226
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853 [inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958 [inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144 [inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff814af8b3>] pipe_lock_nested fs/pipe.c:65 [inline]
[<ffffffff814af8b3>] pipe_lock+0x63/0x80 fs/pipe.c:73
[<ffffffff815342e9>] iter_file_splice_write+0x179/0xb30 fs/splice.c:974
[<ffffffff81537d31>] do_splice_from fs/splice.c:1128 [inline]
[<ffffffff81537d31>] do_splice fs/splice.c:1404 [inline]
[<ffffffff81537d31>] SYSC_splice fs/splice.c:1707 [inline]
[<ffffffff81537d31>] SyS_splice+0xd71/0x13a0 fs/splice.c:1690
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
audit: type=1400 audit(1553227416.560:465): avc: denied { create } for
pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
netlink: 12 bytes leftover after parsing attributes in process
`syz-executor.1'.
tc_dump_action: action bad kind
audit: type=1400 audit(1553227417.010:466): avc: denied { create } for
pid=15003 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_netfilter_socket permissive=1
audit: type=1400 audit(1553227417.220:467): avc: denied { write } for
pid=15003 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_netfilter_socket permissive=1
audit: type=1400 audit(1553227417.250:468): avc: denied { create } for
pid=15003 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_netfilter_socket permissive=1
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=143fe6df200000
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=40690beda1a2266cd4b2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+40690b...@syzkaller.appspotmail.com
audit: type=1400 audit(1553227415.630:460): avc: denied { create } for
pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
======================================================
[ INFO: possible circular locking dependency detected ]
4.4.174+ #4 Not tainted
-------------------------------------------------------
syz-executor.2/14953 is trying to acquire lock:
(&pipe->mutex/1){+.+.+.}, at: [<ffffffff814af8b3>] pipe_lock_nested
fs/pipe.c:65 [inline]
(&pipe->mutex/1){+.+.+.}, at: [<ffffffff814af8b3>] pipe_lock+0x63/0x80
fs/pipe.c:73
but task is already holding lock:
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] file_start_write
include/linux/fs.h:2543 [inline]
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] do_splice
fs/splice.c:1403 [inline]
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SYSC_splice
fs/splice.c:1707 [inline]
(sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SyS_splice+0xf2d/0x13a0
fs/splice.c:1690
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8149ea2f>] percpu_down_read
include/linux/percpu-rwsem.h:26 [inline]
[<ffffffff8149ea2f>] __sb_start_write+0x1af/0x310 fs/super.c:1239
[<ffffffff816c3af4>] sb_start_write include/linux/fs.h:1517 [inline]
[<ffffffff816c3af4>] ext4_run_li_request fs/ext4/super.c:2685
[inline]
[<ffffffff816c3af4>] ext4_lazyinit_thread fs/ext4/super.c:2784
[inline]
[<ffffffff816c3af4>] ext4_lazyinit_thread+0x1e4/0x7b0
fs/ext4/super.c:2760
[<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
[<ffffffff82718fc5>] ret_from_fork+0x55/0x80
arch/x86/entry/entry_64.S:537
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
audit: type=1400 audit(1553227415.800:461): avc: denied { write } for
pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff816cdacd>] ext4_register_li_request+0x2fd/0x7d0
fs/ext4/super.c:2972
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[ 436.857403] audit: type=1400 audit(1553227415.890:462): avc:
denied { write } for pid=14934 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff816cd859>] ext4_register_li_request+0x89/0x7d0
fs/ext4/super.c:2945
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff827139a2>] down_read+0x42/0x60 kernel/locking/rwsem.c:22
[<ffffffff814a1411>] iterate_supers+0xe1/0x250 fs/super.c:547
[<ffffffff819b19f7>] selinux_complete_init+0x2f/0x31
security/selinux/hooks.c:6154
[<ffffffff819a353d>] security_load_policy+0x69d/0x9c0
security/selinux/ss/services.c:2060
[<ffffffff81979e55>] sel_write_load+0x175/0xf90
security/selinux/selinuxfs.c:535
[<ffffffff81496916>] __vfs_write+0x116/0x3d0 fs/read_write.c:491
[<ffffffff81498612>] vfs_write+0x182/0x4e0 fs/read_write.c:540
[<ffffffff8149ac4c>] SYSC_write fs/read_write.c:587 [inline]
[<ffffffff8149ac4c>] SyS_write+0xdc/0x1c0 fs/read_write.c:579
[ 436.986766] audit: type=1400 audit(1553227416.030:463): avc:
denied { read } for pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff81977a39>] sel_commit_bools_write+0x89/0x260
security/selinux/selinuxfs.c:1142
[<ffffffff81496916>] __vfs_write+0x116/0x3d0 fs/read_write.c:491
[<ffffffff81496ce2>] __kernel_write+0x112/0x370 fs/read_write.c:513
[<ffffffff81532e6d>] write_pipe_buf+0x15d/0x1f0 fs/splice.c:1074
[<ffffffff81533b6e>] splice_from_pipe_feed fs/splice.c:776 [inline]
[<ffffffff81533b6e>] __splice_from_pipe+0x37e/0x7a0 fs/splice.c:901
[<ffffffff81536be8>] splice_from_pipe+0x108/0x170 fs/splice.c:936
[<ffffffff81536cdc>] default_file_splice_write+0x3c/0x80
fs/splice.c:1086
[<ffffffff81537d31>] do_splice_from fs/splice.c:1128 [inline]
[<ffffffff81537d31>] do_splice fs/splice.c:1404 [inline]
[<ffffffff81537d31>] SYSC_splice fs/splice.c:1707 [inline]
[<ffffffff81537d31>] SyS_splice+0xd71/0x13a0 fs/splice.c:1690
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853
[inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958
[inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144
[inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
audit: type=1400 audit(1553227416.140:464): avc: denied { read } for
pid=14934 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff814af8b3>] pipe_lock_nested fs/pipe.c:65 [inline]
[<ffffffff814af8b3>] pipe_lock+0x63/0x80 fs/pipe.c:73
[<ffffffff815342e9>] iter_file_splice_write+0x179/0xb30
fs/splice.c:974
[<ffffffff81537d31>] do_splice_from fs/splice.c:1128 [inline]
[<ffffffff81537d31>] do_splice fs/splice.c:1404 [inline]
[<ffffffff81537d31>] SYSC_splice fs/splice.c:1707 [inline]
[<ffffffff81537d31>] SyS_splice+0xd71/0x13a0 fs/splice.c:1690
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
other info that might help us debug this:
Chain exists of:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_writers#4);
lock(&eli->li_list_mtx);
lock(sb_writers#4);
lock(&pipe->mutex/1);
*** DEADLOCK ***
1 lock held by syz-executor.2/14953:
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] file_start_write
include/linux/fs.h:2543 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] do_splice
fs/splice.c:1403 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SYSC_splice
fs/splice.c:1707 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>]
SyS_splice+0xf2d/0x13a0 fs/splice.c:1690
stack backtrace:
CPU: 0 PID: 14953 Comm: syz-executor.2 Not tainted 4.4.174+ #4
0000000000000000 18d547d6cf8cc394 ffff8801bde978b0 ffffffff81aad1a1
ffffffff84057a80 ffff8800b4e997c0 ffffffff83abd2b0 ffffffff83abc380
ffffffff83ac8080 ffff8801bde97900 ffffffff813abcda ffffffff83e1f600
Call Trace:
[<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<ffffffff813abcda>] print_circular_bug.cold+0x2f7/0x44e
kernel/locking/lockdep.c:1226
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853 [inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958 [inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144 [inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff814af8b3>] pipe_lock_nested fs/pipe.c:65 [inline]
[<ffffffff814af8b3>] pipe_lock+0x63/0x80 fs/pipe.c:73
[<ffffffff815342e9>] iter_file_splice_write+0x179/0xb30 fs/splice.c:974
[<ffffffff81537d31>] do_splice_from fs/splice.c:1128 [inline]
[<ffffffff81537d31>] do_splice fs/splice.c:1404 [inline]
[<ffffffff81537d31>] SYSC_splice fs/splice.c:1707 [inline]
[<ffffffff81537d31>] SyS_splice+0xd71/0x13a0 fs/splice.c:1690
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
audit: type=1400 audit(1553227416.560:465): avc: denied { create } for
pid=14960 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
netlink: 12 bytes leftover after parsing attributes in process
`syz-executor.1'.
tc_dump_action: action bad kind
audit: type=1400 audit(1553227417.010:466): avc: denied { create } for
pid=15003 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_netfilter_socket permissive=1
audit: type=1400 audit(1553227417.220:467): avc: denied { write } for
pid=15003 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_netfilter_socket permissive=1
audit: type=1400 audit(1553227417.250:468): avc: denied { create } for
pid=15003 comm="syz-executor.2"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_netfilter_socket permissive=1
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Apr 14, 2019, 5:30:19 AM4/14/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 8fe42840 Merge 4.9.141 into android-4.9
syzbot found the following crash on:
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=14809418c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=22a5ba9f73b6da1d
dashboard link: https://syzkaller.appspot.com/bug?extid=194a64fb76f9ddeb512c
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
======================================================
[ INFO: possible circular locking dependency detected ]
-------------------------------------------------------
syz-executor1/8376 is trying to acquire lock:
netlink: 3 bytes leftover after parsing attributes in process
`syz-executor3'.
audit: type=1401 audit(1547577060.826:58): op=fscreate
invalid_context=1000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000617474722F66736372656174650000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000010003B0E0000000000000000000000000000000000000000000000000F001200080001007674693604000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000002000000000680300
but task is already holding lock:
(&pipe->mutex/1){+.+.+.}, at: [<ffffffff81523c1e>] pipe_lock_nested
fs/pipe.c:66 [inline]
(&pipe->mutex/1){+.+.+.}, at: [<ffffffff81523c1e>] pipe_lock+0x5e/0x70
fs/pipe.c:74
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
the existing dependency chain (in reverse order) is:
__mutex_lock_common kernel/locking/mutex.c:521 [inline]
mutex_lock_nested+0xc0/0x900 kernel/locking/mutex.c:621
__pipe_lock fs/pipe.c:87 [inline]
fifo_open+0x15c/0x9e0 fs/pipe.c:921
do_dentry_open+0x3ef/0xc90 fs/open.c:766
vfs_open+0x11c/0x210 fs/open.c:879
do_last fs/namei.c:3410 [inline]
path_openat+0x542/0x2790 fs/namei.c:3534
do_filp_open+0x197/0x270 fs/namei.c:3568
do_open_execat+0x10f/0x640 fs/exec.c:844
do_execveat_common.isra.14+0x687/0x1ed0 fs/exec.c:1723
do_execve fs/exec.c:1829 [inline]
SYSC_execve fs/exec.c:1910 [inline]
SyS_execve+0x42/0x50 fs/exec.c:1905
do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
entry_SYSCALL_64_after_swapgs+0x5d/0xdb
lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
__mutex_lock_common kernel/locking/mutex.c:521 [inline]
mutex_lock_killable_nested+0xcc/0x9f0 kernel/locking/mutex.c:641
do_io_accounting+0x1fb/0x7e0 fs/proc/base.c:2690
proc_tid_io_accounting+0x1f/0x30 fs/proc/base.c:2733
proc_single_show+0xfd/0x170 fs/proc/base.c:785
seq_read+0x4b6/0x12d0 fs/seq_file.c:240
__vfs_read+0x115/0x560 fs/read_write.c:449
vfs_read+0x124/0x390 fs/read_write.c:472
SYSC_pread64 fs/read_write.c:626 [inline]
SyS_pread64+0x145/0x170 fs/read_write.c:613
do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
entry_SYSCALL_64_after_swapgs+0x5d/0xdb
check_prev_add kernel/locking/lockdep.c:1828 [inline]
check_prevs_add kernel/locking/lockdep.c:1938 [inline]
validate_chain kernel/locking/lockdep.c:2265 [inline]
__lock_acquire+0x3189/0x4a10 kernel/locking/lockdep.c:3345
lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
__mutex_lock_common kernel/locking/mutex.c:521 [inline]
mutex_lock_nested+0xc0/0x900 kernel/locking/mutex.c:621
seq_read+0xdd/0x12d0 fs/seq_file.c:178
proc_reg_read+0xfd/0x180 fs/proc/inode.c:203
do_loop_readv_writev.part.1+0xd5/0x280 fs/read_write.c:718
do_loop_readv_writev fs/read_write.c:707 [inline]
do_readv_writev+0x56e/0x7b0 fs/read_write.c:873
vfs_readv+0x84/0xc0 fs/read_write.c:897
kernel_readv fs/splice.c:363 [inline]
default_file_splice_read+0x451/0x7f0 fs/splice.c:435
do_splice_to+0x10c/0x170 fs/splice.c:899
do_splice fs/splice.c:1192 [inline]
SYSC_splice fs/splice.c:1416 [inline]
SyS_splice+0x10d2/0x14d0 fs/splice.c:1399
do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
entry_SYSCALL_64_after_swapgs+0x5d/0xdb
other info that might help us debug this:
Chain exists of:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sig->cred_guard_mutex);
lock(&pipe->mutex/1);
lock(&p->lock);
*** DEADLOCK ***
1 lock held by syz-executor1/8376:
#0: (&pipe->mutex/1){+.+.+.}, at: [<ffffffff81523c1e>] pipe_lock_nested
fs/pipe.c:66 [inline]
#0: (&pipe->mutex/1){+.+.+.}, at: [<ffffffff81523c1e>]
pipe_lock+0x5e/0x70 fs/pipe.c:74
stack backtrace:
CPU: 0 PID: 8376 Comm: syz-executor1 Not tainted 4.9.141+ #1
ffff8801a285f278 ffffffff81b42e79 ffffffff83ca2fd0 ffffffff83caa290
ffffffff83ca4920 ffff8801c8bd08d0 ffff8801c8bd0000 ffff8801a285f2c0
ffffffff813fee40 0000000000000001 00000000c8bd08b0 0000000000000001
Call Trace:
[<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff813fee40>] print_circular_bug.cold.36+0x2f7/0x432
kernel/locking/lockdep.c:1202
[<ffffffff8120a539>] check_prev_add kernel/locking/lockdep.c:1828 [inline]
[<ffffffff8120a539>] check_prevs_add kernel/locking/lockdep.c:1938 [inline]
[<ffffffff8120a539>] validate_chain kernel/locking/lockdep.c:2265 [inline]
[<ffffffff8120a539>] __lock_acquire+0x3189/0x4a10
kernel/locking/lockdep.c:3345
[<ffffffff8120c8d0>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
[<ffffffff8280b250>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8280b250>] mutex_lock_nested+0xc0/0x900
kernel/locking/mutex.c:621
[<ffffffff8158080d>] seq_read+0xdd/0x12d0 fs/seq_file.c:178
[<ffffffff8165c00d>] proc_reg_read+0xfd/0x180 fs/proc/inode.c:203
[<ffffffff81509df5>] do_loop_readv_writev.part.1+0xd5/0x280
fs/read_write.c:718
[<ffffffff8150b49e>] do_loop_readv_writev fs/read_write.c:707 [inline]
[<ffffffff8150b49e>] do_readv_writev+0x56e/0x7b0 fs/read_write.c:873
[<ffffffff8150b764>] vfs_readv+0x84/0xc0 fs/read_write.c:897
[<ffffffff815ac2a1>] kernel_readv fs/splice.c:363 [inline]
[<ffffffff815ac2a1>] default_file_splice_read+0x451/0x7f0 fs/splice.c:435
[<ffffffff815ab39c>] do_splice_to+0x10c/0x170 fs/splice.c:899
[<ffffffff815b08f2>] do_splice fs/splice.c:1192 [inline]
[<ffffffff815b08f2>] SYSC_splice fs/splice.c:1416 [inline]
[<ffffffff815b08f2>] SyS_splice+0x10d2/0x14d0 fs/splice.c:1399
[<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
[<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
syzbot
Aug 13, 2019, 11:56:08 AM8/13/19
to syzkaller-a...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=10f16096600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1661c56a600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+40690b...@syzkaller.appspotmail.com
1 lock held by syz-executor290/2085:
0000000000000000 3e6e76746fdc743e ffff8800b64078b0 ffffffff81aad1a1
ffffffff84057a80 ffff8800b722df00 ffffffff83abd2b0 ffffffff83abc380
ffffffff83ac8080 ffff8800b6407900 ffffffff813abcda ffffffff83e1ee80
HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=40690beda1a2266cd4b2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d546d2600000
dashboard link: https://syzkaller.appspot.com/bug?extid=40690beda1a2266cd4b2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1661c56a600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+40690b...@syzkaller.appspotmail.com
======================================================
[ INFO: possible circular locking dependency detected ]
4.4.174+ #4 Not tainted
-------------------------------------------------------
syz-executor290/2085 is trying to acquire lock:
[ INFO: possible circular locking dependency detected ]
4.4.174+ #4 Not tainted
-------------------------------------------------------
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff816cdacd>] ext4_register_li_request+0x2fd/0x7d0
fs/ext4/super.c:2972
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff816cdacd>] ext4_register_li_request+0x2fd/0x7d0
fs/ext4/super.c:2972
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff8270c191>] __mutex_lock_common kernel/locking/mutex.c:521
[inline]
[<ffffffff8270c191>] mutex_lock_nested+0xc1/0xb80
kernel/locking/mutex.c:621
[<ffffffff816cd859>] ext4_register_li_request+0x89/0x7d0
fs/ext4/super.c:2945
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff827139a2>] down_read+0x42/0x60 kernel/locking/rwsem.c:22
[<ffffffff814a1411>] iterate_supers+0xe1/0x250 fs/super.c:547
[<ffffffff819b19f7>] selinux_complete_init+0x2f/0x31
security/selinux/hooks.c:6154
[<ffffffff819a353d>] security_load_policy+0x69d/0x9c0
security/selinux/ss/services.c:2060
[<ffffffff81979e55>] sel_write_load+0x175/0xf90
security/selinux/selinuxfs.c:535
[<ffffffff81496916>] __vfs_write+0x116/0x3d0 fs/read_write.c:491
[<ffffffff81498612>] vfs_write+0x182/0x4e0 fs/read_write.c:540
[<ffffffff8149ac4c>] SYSC_write fs/read_write.c:587 [inline]
[<ffffffff8149ac4c>] SyS_write+0xdc/0x1c0 fs/read_write.c:579
fs/ext4/super.c:2945
[<ffffffff816cf306>] ext4_remount+0x1366/0x1b90 fs/ext4/super.c:4922
[<ffffffff814a1ccb>] do_remount_sb2+0x41b/0x7a0 fs/super.c:781
[<ffffffff815028ab>] do_remount fs/namespace.c:2347 [inline]
[<ffffffff815028ab>] do_mount+0xfdb/0x2a40 fs/namespace.c:2860
[<ffffffff81504d00>] SYSC_mount fs/namespace.c:3063 [inline]
[<ffffffff81504d00>] SyS_mount+0x130/0x1d0 fs/namespace.c:3041
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff827139a2>] down_read+0x42/0x60 kernel/locking/rwsem.c:22
[<ffffffff814a1411>] iterate_supers+0xe1/0x250 fs/super.c:547
[<ffffffff819b19f7>] selinux_complete_init+0x2f/0x31
security/selinux/hooks.c:6154
[<ffffffff819a353d>] security_load_policy+0x69d/0x9c0
security/selinux/ss/services.c:2060
[<ffffffff81979e55>] sel_write_load+0x175/0xf90
security/selinux/selinuxfs.c:535
[<ffffffff81496916>] __vfs_write+0x116/0x3d0 fs/read_write.c:491
[<ffffffff81498612>] vfs_write+0x182/0x4e0 fs/read_write.c:540
[<ffffffff8149ac4c>] SYSC_write fs/read_write.c:587 [inline]
[<ffffffff8149ac4c>] SyS_write+0xdc/0x1c0 fs/read_write.c:579
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] file_start_write
include/linux/fs.h:2543 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] do_splice
fs/splice.c:1403 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SYSC_splice
fs/splice.c:1707 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>]
SyS_splice+0xf2d/0x13a0 fs/splice.c:1690
stack backtrace:
CPU: 0 PID: 2085 Comm: syz-executor290 Not tainted 4.4.174+ #4
include/linux/fs.h:2543 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] do_splice
fs/splice.c:1403 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>] SYSC_splice
fs/splice.c:1707 [inline]
#0: (sb_writers#4){.+.+.+}, at: [<ffffffff81537eed>]
SyS_splice+0xf2d/0x13a0 fs/splice.c:1690
stack backtrace:
0000000000000000 3e6e76746fdc743e ffff8800b64078b0 ffffffff81aad1a1
ffffffff84057a80 ffff8800b722df00 ffffffff83abd2b0 ffffffff83abc380
ffffffff83ac8080 ffff8800b6407900 ffffffff813abcda ffffffff83e1ee80
syzbot
Feb 21, 2020, 7:40:07 AM2/21/20
to syzkaller-a...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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