possible deadlock in __do_page_fault (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 3c09c195 Add linux-next specific files for 20190531
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=100a5f26a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6cfb24468280cd5c
dashboard link: https://syzkaller.appspot.com/bug?extid=606e524a3ca9617cf8c0
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+606e52...@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
5.2.0-rc2-next-20190531 #4 Not tainted
------------------------------------------------------
syz-executor.1/28460 is trying to acquire lock:
000000007749dcbb (&mm->mmap_sem#2){++++}, at: do_user_addr_fault
arch/x86/mm/fault.c:1407 [inline]
000000007749dcbb (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x9e9/0xda0
arch/x86/mm/fault.c:1522

but task is already holding lock:
000000000005b591 (&sb->s_type->i_mutex_key#10){++++}, at: inode_trylock
include/linux/fs.h:798 [inline]
000000000005b591 (&sb->s_type->i_mutex_key#10){++++}, at:
ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sb->s_type->i_mutex_key#10){++++}:
down_write+0x38/0xa0 kernel/locking/rwsem.c:66
inode_lock include/linux/fs.h:778 [inline]
process_measurement+0x15ae/0x15e0
security/integrity/ima/ima_main.c:228
ima_file_mmap+0x11a/0x130 security/integrity/ima/ima_main.c:370
security_file_mprotect+0xd5/0x100 security/security.c:1430
do_mprotect_pkey+0x537/0xa30 mm/mprotect.c:550
__do_sys_pkey_mprotect mm/mprotect.c:590 [inline]
__se_sys_pkey_mprotect mm/mprotect.c:587 [inline]
__x64_sys_pkey_mprotect+0x97/0xf0 mm/mprotect.c:587
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&mm->mmap_sem#2){++++}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300
down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24
do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
__do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1522
do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1553
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156
fault_in_pages_readable include/linux/pagemap.h:600 [inline]
iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:426
generic_perform_write+0x186/0x520 mm/filemap.c:3197
__generic_file_write_iter+0x25e/0x630 mm/filemap.c:3336
ext4_file_write_iter+0x332/0x1070 fs/ext4/file.c:266
call_write_iter include/linux/fs.h:1870 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#10);
lock(&mm->mmap_sem#2);
lock(&sb->s_type->i_mutex_key#10);
lock(&mm->mmap_sem#2);

*** DEADLOCK ***

3 locks held by syz-executor.1/28460:
#0: 00000000f0dc03f3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
#1: 000000001d3176fb (sb_writers#3){.+.+}, at: file_start_write
include/linux/fs.h:2836 [inline]
#1: 000000001d3176fb (sb_writers#3){.+.+}, at: vfs_write+0x485/0x5d0
fs/read_write.c:557
#2: 000000000005b591 (&sb->s_type->i_mutex_key#10){++++}, at:
inode_trylock include/linux/fs.h:798 [inline]
#2: 000000000005b591 (&sb->s_type->i_mutex_key#10){++++}, at:
ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232

stack backtrace:
CPU: 1 PID: 28460 Comm: syz-executor.1 Not tainted 5.2.0-rc2-next-20190531
#4
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+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.cold+0x1cc/0x28f kernel/locking/lockdep.c:1566
check_prev_add kernel/locking/lockdep.c:2311 [inline]
check_prevs_add kernel/locking/lockdep.c:2419 [inline]
validate_chain kernel/locking/lockdep.c:2801 [inline]
__lock_acquire+0x3755/0x5490 kernel/locking/lockdep.c:3790
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300
down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24
do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
__do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1522
do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1553
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:600 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:426
Code: 89 f6 41 88 57 e0 e8 48 e5 3c fe 45 85 f6 74 c1 e9 70 fe ff ff e8 b9
e3 3c fe 0f 1f 00 0f ae e8 44 89 f0 48 8b 8d 68 ff ff ff <8a> 11 89 c3 0f
1f 00 41 88 57 d0 31 ff 89 de e8 15 e5 3c fe 85 db
RSP: 0018:ffff88803dde7918 EFLAGS: 00010212
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000002008a17f
RDX: 000000000003eb3f RSI: ffffffff833406b7 RDI: 0000000000000007
RBP: ffff88803dde79b8 R08: ffff8880a83d03c0 R09: 0000000000000004
R10: ffffed1015d26be7 R11: ffff8880ae935f3b R12: 0000000000001000
R13: 0000000000001000 R14: 0000000000000000 R15: ffff88803dde7990
generic_perform_write+0x186/0x520 mm/filemap.c:3197
__generic_file_write_iter+0x25e/0x630 mm/filemap.c:3336
ext4_file_write_iter+0x332/0x1070 fs/ext4/file.c:266
call_write_iter include/linux/fs.h:1870 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f506babec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 00000000fffffcad RSI: 0000000020000180 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f506babf6d4
R13: 00000000004c8838 R14: 00000000004df120 R15: 00000000ffffffff


---
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]

syzbot has found a reproducer for the following crash on:

HEAD commit: 3c09c195 Add linux-next specific files for 20190531
git tree: linux-next

console output: https://syzkaller.appspot.com/x/log.txt?x=134e29dea00000

kernel config: https://syzkaller.appspot.com/x/.config?x=6cfb24468280cd5c
dashboard link: https://syzkaller.appspot.com/bug?extid=606e524a3ca9617cf8c0
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10572ca6a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+606e52...@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
5.2.0-rc2-next-20190531 #4 Not tainted
------------------------------------------------------

syz-executor.0/16846 is trying to acquire lock:
00000000120cad2f (&mm->mmap_sem#2){++++}, at: do_user_addr_fault
arch/x86/mm/fault.c:1407 [inline]
00000000120cad2f (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x9e9/0xda0

arch/x86/mm/fault.c:1522

but task is already holding lock:

00000000fd4e5238 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock
include/linux/fs.h:798 [inline]
00000000fd4e5238 (&sb->s_type->i_mutex_key#10){+.+.}, at:

ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sb->s_type->i_mutex_key#10){+.+.}:

3 locks held by syz-executor.0/16846:
#0: 00000000ae9485f5 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
#1: 00000000485be47f (sb_writers#3){.+.+}, at: file_start_write
include/linux/fs.h:2836 [inline]
#1: 00000000485be47f (sb_writers#3){.+.+}, at: vfs_write+0x485/0x5d0
fs/read_write.c:557
#2: 00000000fd4e5238 (&sb->s_type->i_mutex_key#10){+.+.}, at:
inode_trylock include/linux/fs.h:798 [inline]
#2: 00000000fd4e5238 (&sb->s_type->i_mutex_key#10){+.+.}, at:

ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232

stack backtrace:

CPU: 1 PID: 16846 Comm: syz-executor.0 Not tainted 5.2.0-rc2-next-20190531

#4
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+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.cold+0x1cc/0x28f kernel/locking/lockdep.c:1566
check_prev_add kernel/locking/lockdep.c:2311 [inline]
check_prevs_add kernel/locking/lockdep.c:2419 [inline]
validate_chain kernel/locking/lockdep.c:2801 [inline]
__lock_acquire+0x3755/0x5490 kernel/locking/lockdep.c:3790
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300
down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24
do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
__do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1522
do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1553
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:600 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:426
Code: 89 f6 41 88 57 e0 e8 48 e5 3c fe 45 85 f6 74 c1 e9 70 fe ff ff e8 b9
e3 3c fe 0f 1f 00 0f ae e8 44 89 f0 48 8b 8d 68 ff ff ff <8a> 11 89 c3 0f
1f 00 41 88 57 d0 31 ff 89 de e8 15 e5 3c fe 85 db

RSP: 0018:ffff88808bd7f918 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000002000127f
RDX: 0000000000000000 RSI: ffffffff833406b7 RDI: 0000000000000007
RBP: ffff88808bd7f9b8 R08: ffff888085396040 R09: ffff888085396938
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000001000
R13: 0000000000001000 R14: 0000000000000000 R15: ffff88808bd7f990

generic_perform_write+0x186/0x520 mm/filemap.c:3197
__generic_file_write_iter+0x25e/0x630 mm/filemap.c:3336
ext4_file_write_iter+0x332/0x1070 fs/ext4/file.c:266
call_write_iter include/linux/fs.h:1870 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00

RSP: 002b:00007fedf6831c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001

RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279

RDX: 000000000000ff7f RSI: 0000000020000280 RDI: 0000000000000003

RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 00007fedf68326d4
R13: 00000000004c8aa4 R14: 00000000004df468 R15: 00000000ffffffff

[syzbot]

syzbot has bisected this bug to:

commit 69d61f577d147b396be0991b2ac6f65057f7d445
Author: Mimi Zohar <zo...@linux.ibm.com>
Date: Wed Apr 3 21:47:46 2019 +0000

ima: verify mprotect change is consistent with mmap policy

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16461c5aa00000
start commit: 3c09c195 Add linux-next specific files for 20190531
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=15461c5aa00000
console output: https://syzkaller.appspot.com/x/log.txt?x=11461c5aa00000

kernel config: https://syzkaller.appspot.com/x/.config?x=6cfb24468280cd5c
dashboard link: https://syzkaller.appspot.com/bug?extid=606e524a3ca9617cf8c0

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10572ca6a00000

Reported-by: syzbot+606e52...@syzkaller.appspotmail.com
Fixes: 69d61f577d14 ("ima: verify mprotect change is consistent with mmap
policy")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: 56b697c6 Add linux-next specific files for 20190604
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12d210d4a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=4248d6bc70076f7d

dashboard link: https://syzkaller.appspot.com/bug?extid=606e524a3ca9617cf8c0
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ddae0ea00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e78f16a00000

The bug was bisected to:

commit 69d61f577d147b396be0991b2ac6f65057f7d445
Author: Mimi Zohar <zo...@linux.ibm.com>
Date: Wed Apr 3 21:47:46 2019 +0000

ima: verify mprotect change is consistent with mmap policy

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16461c5aa00000

final crash: https://syzkaller.appspot.com/x/report.txt?x=15461c5aa00000
console output: https://syzkaller.appspot.com/x/log.txt?x=11461c5aa00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+606e52...@syzkaller.appspotmail.com

Fixes: 69d61f577d14 ("ima: verify mprotect change is consistent with mmap
policy")

======================================================
WARNING: possible circular locking dependency detected

5.2.0-rc3-next-20190604 #8 Not tainted
------------------------------------------------------
syz-executor361/10886 is trying to acquire lock:
00000000c4471342 (&mm->mmap_sem#2){++++}, at: do_user_addr_fault
arch/x86/mm/fault.c:1406 [inline]
00000000c4471342 (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x9e9/0xda0
arch/x86/mm/fault.c:1521

but task is already holding lock:

000000009878d2b3 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock
include/linux/fs.h:798 [inline]
000000009878d2b3 (&sb->s_type->i_mutex_key#10){+.+.}, at:

ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sb->s_type->i_mutex_key#10){+.+.}:

down_write+0x38/0xa0 kernel/locking/rwsem.c:66
inode_lock include/linux/fs.h:778 [inline]
process_measurement+0x15ae/0x15e0
security/integrity/ima/ima_main.c:228
ima_file_mmap+0x11a/0x130 security/integrity/ima/ima_main.c:370

security_file_mprotect+0xd5/0x100 security/security.c:1426
do_mprotect_pkey+0x537/0xa30 mm/mprotect.c:550
__do_sys_mprotect mm/mprotect.c:582 [inline]
__se_sys_mprotect mm/mprotect.c:579 [inline]
__x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:579

do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&mm->mmap_sem#2){++++}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300
down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24

do_user_addr_fault arch/x86/mm/fault.c:1406 [inline]
__do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1521
do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1552

3 locks held by syz-executor361/10886:
#0: 00000000b8e64295 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
#1: 00000000e032805f (sb_writers#3){.+.+}, at: file_start_write
include/linux/fs.h:2836 [inline]
#1: 00000000e032805f (sb_writers#3){.+.+}, at: vfs_write+0x485/0x5d0
fs/read_write.c:557
#2: 000000009878d2b3 (&sb->s_type->i_mutex_key#10){+.+.}, at:
inode_trylock include/linux/fs.h:798 [inline]
#2: 000000009878d2b3 (&sb->s_type->i_mutex_key#10){+.+.}, at:

ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232

stack backtrace:

CPU: 0 PID: 10886 Comm: syz-executor361 Not tainted 5.2.0-rc3-next-20190604
#8

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+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.cold+0x1cc/0x28f kernel/locking/lockdep.c:1566
check_prev_add kernel/locking/lockdep.c:2311 [inline]
check_prevs_add kernel/locking/lockdep.c:2419 [inline]
validate_chain kernel/locking/lockdep.c:2801 [inline]
__lock_acquire+0x3755/0x5490 kernel/locking/lockdep.c:3790
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300
down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24

do_user_addr_fault arch/x86/mm/fault.c:1406 [inline]
__do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1521
do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1552

page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:600 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:426

Code: 89 f6 41 88 57 e0 e8 b8 dd 3c fe 45 85 f6 74 c1 e9 70 fe ff ff e8 29
dc 3c fe 0f 1f 00 0f ae e8 44 89 f0 48 8b 8d 68 ff ff ff <8a> 11 89 c3 0f
1f 00 41 88 57 d0 31 ff 89 de e8 85 dd 3c fe 85 db
RSP: 0018:ffff88808ca6f918 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000200011ff
RDX: 0000000000000000 RSI: ffffffff83341b37 RDI: 0000000000000007
RBP: ffff88808ca6f9b8 R08: ffff88809be68000 R09: ffff88809be688f8
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000001000
R13: 0000000000001000 R14: 0000000000000000 R15: ffff88808ca6f990

generic_perform_write+0x186/0x520 mm/filemap.c:3197
__generic_file_write_iter+0x25e/0x630 mm/filemap.c:3336
ext4_file_write_iter+0x332/0x1070 fs/ext4/file.c:266
call_write_iter include/linux/fs.h:1870 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe

RIP: 0033:0x446939
Code: e8 4c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7

48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff

ff 0f 83 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007effabbcdce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446939
RDX: 000000000007fe00 RSI: 0000000020000200 RDI: 0000000000000006
RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c
R13: 00007ffd5dd15ddf R14: 00007effabbce9c0 R15: 20c49ba5e353f7cf

[Mimi Zohar]

Thank you for the report.

Mimi

[Eric Biggers]

This patch was dropped from linux-next, so let's invalidate this bug report.

#syz invalid

- Eric