INFO: task hung in packet_release
७ भ्यु
नपढिएको पहिलो सन्देशमा जानुहोस्
syzbot
२०१८ सेप्टेम्बर १३, ०९:१३:०४१८/९/१३
प्रापक syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 4b1c5d917d34 bpf: btf: Fix end boundary calculation for ty..
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=1116e5ae400000
kernel config: https://syzkaller.appspot.com/x/.config?x=ae23ea8dbf4c4206
dashboard link: https://syzkaller.appspot.com/bug?extid=eccbee7c7ae0d71a871b
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [alexande...@intel.com da...@davemloft.net
edum...@google.com kees...@chromium.org ktk...@virtuozzo.com
linux-...@vger.kernel.org liron...@baidu.com magnus....@intel.com
mal...@google.com net...@vger.kernel.org wil...@google.com]
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+eccbee...@syzkaller.appspotmail.com
INFO: task syz-executor1:815 blocked for more than 140 seconds.
Not tainted 4.19.0-rc2+ #52
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D23176 815 5359 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
_synchronize_rcu_expedited+0xc68/0xfd0 kernel/rcu/tree_exp.h:667
synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:795
synchronize_net+0x3b/0x60 net/core/dev.c:9012
packet_release+0x926/0xda0 net/packet/af_packet.c:3006
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1139
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410e91
Code: ff 48 8d 05 59 89 0a 01 48 89 84 24 c0 00 00 00 48 8b ac 24 98 00 00
00 48 81 c4 a0 00 00 00 c3 e8 14 90 01 00 0f 0b e8 0d 90 <01> 00 0f 0b e8
06 90 01 00 0f 0b e8 ff 8f 01 00 0f 0b 48 8d 05 36
RSP: 002b:00007ffe5f940220 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000410e91
RDX: 0000000000000000 RSI: 0000000000730518 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000060e07 R14: 00000000000004d5 R15: badc0ffeebadface
INFO: task syz-executor2:823 blocked for more than 140 seconds.
Not tainted 4.19.0-rc2+ #52
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2 D23400 823 5360 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
_synchronize_rcu_expedited+0xc68/0xfd0 kernel/rcu/tree_exp.h:667
synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:795
synchronize_net+0x3b/0x60 net/core/dev.c:9012
packet_release+0x926/0xda0 net/packet/af_packet.c:3006
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1139
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410e91
Code: ff 48 8d 05 59 89 0a 01 48 89 84 24 c0 00 00 00 48 8b ac 24 98 00 00
00 48 81 c4 a0 00 00 00 c3 e8 14 90 01 00 0f 0b e8 0d 90 <01> 00 0f 0b e8
06 90 01 00 0f 0b e8 ff 8f 01 00 0f 0b 48 8d 05 36
RSP: 002b:00007ffd1b46e4e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000410e91
RDX: 0000000000000000 RSI: 0000000000730518 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000060de2 R14: 00000000000004f2 R15: badc0ffeebadface
INFO: task syz-executor3:826 blocked for more than 140 seconds.
Not tainted 4.19.0-rc2+ #52
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D23400 826 5361 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
_synchronize_rcu_expedited+0xc68/0xfd0 kernel/rcu/tree_exp.h:667
synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:795
synchronize_net+0x3b/0x60 net/core/dev.c:9012
packet_release+0x926/0xda0 net/packet/af_packet.c:3006
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1139
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410e91
Code: ff 48 8d 05 59 89 0a 01 48 89 84 24 c0 00 00 00 48 8b ac 24 98 00 00
00 48 81 c4 a0 00 00 00 c3 e8 14 90 01 00 0f 0b e8 0d 90 <01> 00 0f 0b e8
06 90 01 00 0f 0b e8 ff 8f 01 00 0f 0b 48 8d 05 36
RSP: 002b:00007ffc7c8009f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000410e91
RDX: 0000000000000000 RSI: 0000000000730518 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000060ded R14: 000000000000051c R15: badc0ffeebadface
Showing all locks held in the system:
1 lock held by khungtaskd/985:
#0: 00000000e1156992 (rcu_read_lock){....}, at:
debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4436
1 lock held by rsyslogd/5221:
#0: 00000000b144b385 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200
fs/file.c:766
2 locks held by getty/5312:
#0: 00000000cc58f9c9 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000f7db70cf (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5313:
#0: 0000000038a2b0dc (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000007d57b9cf (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5314:
#0: 000000000d3ac67b (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000ad9348ac (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5315:
#0: 0000000087c89046 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000ee92f35f (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5316:
#0: 00000000d76ca9e1 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000006977c99f (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5317:
#0: 00000000e0608d2e (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000f90ae13b (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5318:
#0: 000000001dc8ea77 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000008985db90 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
1 lock held by syz-executor1/815:
#0: 00000000403f514f (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:738 [inline]
#0: 00000000403f514f (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
1 lock held by syz-executor2/823:
#0: 00000000128bb27e (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:738 [inline]
#0: 00000000128bb27e (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
1 lock held by syz-executor3/826:
#0: 00000000697a54e4 (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:738 [inline]
#0: 00000000697a54e4 (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 985 Comm: khungtaskd Not tainted 4.19.0-rc2+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
watchdog+0xb3e/0x1050 kernel/hung_task.c:265
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10
arch/x86/include/asm/irqflags.h:57
---
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#bug-status-tracking for how to communicate with
syzbot.
syzbot found the following crash on:
HEAD commit: 4b1c5d917d34 bpf: btf: Fix end boundary calculation for ty..
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=1116e5ae400000
kernel config: https://syzkaller.appspot.com/x/.config?x=ae23ea8dbf4c4206
dashboard link: https://syzkaller.appspot.com/bug?extid=eccbee7c7ae0d71a871b
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [alexande...@intel.com da...@davemloft.net
edum...@google.com kees...@chromium.org ktk...@virtuozzo.com
linux-...@vger.kernel.org liron...@baidu.com magnus....@intel.com
mal...@google.com net...@vger.kernel.org wil...@google.com]
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+eccbee...@syzkaller.appspotmail.com
INFO: task syz-executor1:815 blocked for more than 140 seconds.
Not tainted 4.19.0-rc2+ #52
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D23176 815 5359 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
_synchronize_rcu_expedited+0xc68/0xfd0 kernel/rcu/tree_exp.h:667
synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:795
synchronize_net+0x3b/0x60 net/core/dev.c:9012
packet_release+0x926/0xda0 net/packet/af_packet.c:3006
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1139
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410e91
Code: ff 48 8d 05 59 89 0a 01 48 89 84 24 c0 00 00 00 48 8b ac 24 98 00 00
00 48 81 c4 a0 00 00 00 c3 e8 14 90 01 00 0f 0b e8 0d 90 <01> 00 0f 0b e8
06 90 01 00 0f 0b e8 ff 8f 01 00 0f 0b 48 8d 05 36
RSP: 002b:00007ffe5f940220 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000410e91
RDX: 0000000000000000 RSI: 0000000000730518 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000060e07 R14: 00000000000004d5 R15: badc0ffeebadface
INFO: task syz-executor2:823 blocked for more than 140 seconds.
Not tainted 4.19.0-rc2+ #52
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2 D23400 823 5360 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
_synchronize_rcu_expedited+0xc68/0xfd0 kernel/rcu/tree_exp.h:667
synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:795
synchronize_net+0x3b/0x60 net/core/dev.c:9012
packet_release+0x926/0xda0 net/packet/af_packet.c:3006
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1139
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410e91
Code: ff 48 8d 05 59 89 0a 01 48 89 84 24 c0 00 00 00 48 8b ac 24 98 00 00
00 48 81 c4 a0 00 00 00 c3 e8 14 90 01 00 0f 0b e8 0d 90 <01> 00 0f 0b e8
06 90 01 00 0f 0b e8 ff 8f 01 00 0f 0b 48 8d 05 36
RSP: 002b:00007ffd1b46e4e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000410e91
RDX: 0000000000000000 RSI: 0000000000730518 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000060de2 R14: 00000000000004f2 R15: badc0ffeebadface
INFO: task syz-executor3:826 blocked for more than 140 seconds.
Not tainted 4.19.0-rc2+ #52
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D23400 826 5361 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
_synchronize_rcu_expedited+0xc68/0xfd0 kernel/rcu/tree_exp.h:667
synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:795
synchronize_net+0x3b/0x60 net/core/dev.c:9012
packet_release+0x926/0xda0 net/packet/af_packet.c:3006
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1139
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410e91
Code: ff 48 8d 05 59 89 0a 01 48 89 84 24 c0 00 00 00 48 8b ac 24 98 00 00
00 48 81 c4 a0 00 00 00 c3 e8 14 90 01 00 0f 0b e8 0d 90 <01> 00 0f 0b e8
06 90 01 00 0f 0b e8 ff 8f 01 00 0f 0b 48 8d 05 36
RSP: 002b:00007ffc7c8009f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000410e91
RDX: 0000000000000000 RSI: 0000000000730518 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000060ded R14: 000000000000051c R15: badc0ffeebadface
Showing all locks held in the system:
1 lock held by khungtaskd/985:
#0: 00000000e1156992 (rcu_read_lock){....}, at:
debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4436
1 lock held by rsyslogd/5221:
#0: 00000000b144b385 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200
fs/file.c:766
2 locks held by getty/5312:
#0: 00000000cc58f9c9 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000f7db70cf (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5313:
#0: 0000000038a2b0dc (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000007d57b9cf (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5314:
#0: 000000000d3ac67b (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000ad9348ac (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5315:
#0: 0000000087c89046 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000ee92f35f (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5316:
#0: 00000000d76ca9e1 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000006977c99f (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5317:
#0: 00000000e0608d2e (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000f90ae13b (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5318:
#0: 000000001dc8ea77 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000008985db90 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
1 lock held by syz-executor1/815:
#0: 00000000403f514f (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:738 [inline]
#0: 00000000403f514f (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
1 lock held by syz-executor2/823:
#0: 00000000128bb27e (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:738 [inline]
#0: 00000000128bb27e (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
1 lock held by syz-executor3/826:
#0: 00000000697a54e4 (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:738 [inline]
#0: 00000000697a54e4 (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 985 Comm: khungtaskd Not tainted 4.19.0-rc2+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
watchdog+0xb3e/0x1050 kernel/hung_task.c:265
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10
arch/x86/include/asm/irqflags.h:57
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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Dmitry Vyukov
२०१९ अक्टोबर २३, ०३:२१:१११९/१०/२३
प्रापक syzbot, 'Dmitry Vyukov' via syzkaller-upstream-moderation
After https://github.com/google/syzkaller/commit/37dc03de04826cc0d5d1e3699832b0a3113d40af
this should be re-detected as "task hung in synchronize_rcu"
#syz invalid
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this should be re-detected as "task hung in synchronize_rcu"
#syz invalid
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