kworker/dying (23) used greatest stack depth: 12776 bytes left
INFO: task syz-executor0:4546 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D21232 4546 1 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_write include/linux/fs.h:1554 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:386
filename_create+0x13e/0x5b0 fs/namei.c:3640
user_path_create fs/namei.c:3703 [inline]
do_mkdirat+0xda/0x310 fs/namei.c:3842
__do_sys_mkdir fs/namei.c:3866 [inline]
__se_sys_mkdir fs/namei.c:3864 [inline]
__x64_sys_mkdir+0x5c/0x80 fs/namei.c:3864
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455267
Code: 00 00 48 8b 4c 24 78 8b 44 01 04 89 44 24 08 48 8b 84 24 c8 00 00 00 48 89 04 24 e8 53 e7 ff ff 48 8b 44 24 10 48 89 84 24 d0 <00> 00 00 48 8b 8c 24 f8 00 00 00 48 8b 54 24 78 8b 4c 0a 04 89 4c
RSP: 002b:00007ffc69770348 EFLAGS: 00000206 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffc69770370 RCX: 0000000000455267
RDX: 00007ffc69771025 RSI: 00000000000001ff RDI: 00007ffc69771020
RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000000000005
R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000001380 R14: 00007ffc697709f0 R15: 00000000007034c0
INFO: task syz-executor3:4548 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D21232 4548 1 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_write include/linux/fs.h:1554 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:386
do_unlinkat+0x2b7/0xa30 fs/namei.c:4055
__do_sys_unlink fs/namei.c:4120 [inline]
__se_sys_unlink fs/namei.c:4118 [inline]
__x64_sys_unlink+0x42/0x50 fs/namei.c:4118
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b77
Code: c0 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 89 74 24 28 48 83 c0 02 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 8d 7e 20 40 80 <ff> 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f
RSP: 002b:00007ffed9743b68 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77
RDX: 00007ffed9743b70 RSI: 00007ffed9743c00 RDI: 00007ffed9743c00
RBP: 00007ffed9745910 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000202 R12: 0000000001d82940
R13: 0000000000000000 R14: 00007ffed97452e0 R15: 0000000000702140
INFO: task syz-executor4:4551 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4 D21232 4551 1 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_write include/linux/fs.h:1554 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:386
filename_create+0x13e/0x5b0 fs/namei.c:3640
user_path_create fs/namei.c:3703 [inline]
do_mkdirat+0xda/0x310 fs/namei.c:3842
__do_sys_mkdir fs/namei.c:3866 [inline]
__se_sys_mkdir fs/namei.c:3864 [inline]
__x64_sys_mkdir+0x5c/0x80 fs/namei.c:3864
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455267
Code: 00 00 48 8b 4c 24 78 8b 44 01 04 89 44 24 08 48 8b 84 24 c8 00 00 00 48 89 04 24 e8 53 e7 ff ff 48 8b 44 24 10 48 89 84 24 d0 <00> 00 00 48 8b 8c 24 f8 00 00 00 48 8b 54 24 78 8b 4c 0a 04 89 4c
RSP: 002b:00007fff5f71c1c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fff5f71c1f0 RCX: 0000000000455267
RDX: 00007fff5f71cea5 RSI: 00000000000001ff RDI: 00007fff5f71cea0
RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000000000005
R10: 0000000000000064 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000001380 R14: 00007fff5f71c870 R15: 00000000007034c0
INFO: task syz-executor5:4552 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5 D19720 4552 4544 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_write include/linux/fs.h:1554 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:386
do_unlinkat+0x2b7/0xa30 fs/namei.c:4055
__do_sys_unlink fs/namei.c:4120 [inline]
__se_sys_unlink fs/namei.c:4118 [inline]
__x64_sys_unlink+0x42/0x50 fs/namei.c:4118
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b77
Code: c0 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 89 74 24 28 48 83 c0 02 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 8d 7e 20 40 80 <ff> 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f
RSP: 002b:00007ffc9048f0f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77
RDX: 00007ffc9048f100 RSI: 00007ffc9048f190 RDI: 00007ffc9048f190
RBP: 00007ffc90490ea0 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000202 R12: 00000000026cd940
R13: 0000000000000000 R14: 00007ffc90490870 R15: 0000000000702140
INFO: task syz-executor1:25679 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D24696 25679 4549 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_pagefault include/linux/fs.h:1583 [inline]
ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6126
do_page_mkwrite+0x14e/0x520 mm/memory.c:2380
wp_page_shared mm/memory.c:2676 [inline]
do_wp_page+0xf78/0x19b0 mm/memory.c:2776
handle_pte_fault mm/memory.c:3988 [inline]
__handle_mm_fault+0x2a84/0x4460 mm/memory.c:4096
handle_mm_fault+0x53e/0xc80 mm/memory.c:4133
__do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1396
do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c
RSP: 002b:00007ffe1eeb8340 EFLAGS: 00010287
RAX: 0000001b2f920750 RBX: 0000000000000000 RCX: 0000001b30920000
RDX: 0000001b2f920754 RSI: 0000000000000002 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffe1eeb8380 R11: 0000000000000246 R12: 000000000000006b
R13: 0000000000000002 R14: 000000000072bf48 R15: 000000000072bf48
INFO: task syz-executor2:25703 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2 D23208 25703 19014 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_pagefault include/linux/fs.h:1583 [inline]
ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6126
do_page_mkwrite+0x14e/0x520 mm/memory.c:2380
wp_page_shared mm/memory.c:2676 [inline]
do_wp_page+0xf78/0x19b0 mm/memory.c:2776
handle_pte_fault mm/memory.c:3988 [inline]
__handle_mm_fault+0x2a84/0x4460 mm/memory.c:4096
handle_mm_fault+0x53e/0xc80 mm/memory.c:4133
__do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1396
do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c
RSP: 002b:00007ffebf07f870 EFLAGS: 00010283
RAX: 0000001b2d6224bc RBX: 0000000000000000 RCX: 0000001b2e620000
RDX: 0000001b2d6224c0 RSI: 0000000000000011 RDI: 0000000000000011
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffebf07f8b0 R11: 0000000000000246 R12: 0000000000000016
R13: 0000000000000002 R14: 000000000072bff0 R15: 000000000072bff0
INFO: task syz-executor7:25716 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7 D24696 25716 4550 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_pagefault include/linux/fs.h:1583 [inline]
ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6126
do_page_mkwrite+0x14e/0x520 mm/memory.c:2380
wp_page_shared mm/memory.c:2676 [inline]
do_wp_page+0xf78/0x19b0 mm/memory.c:2776
handle_pte_fault mm/memory.c:3988 [inline]
__handle_mm_fault+0x2a84/0x4460 mm/memory.c:4096
handle_mm_fault+0x53e/0xc80 mm/memory.c:4133
__do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1396
do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c
RSP: 002b:00007ffe015d9ae0 EFLAGS: 00010283
RAX: 0000001b2fa22fa8 RBX: 0000000000000000 RCX: 0000001b30a20000
RDX: 0000001b2fa22fac RSI: 0000000000730288 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffe015d9b20 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0
INFO: task syz-executor6:25719 blocked for more than 140 seconds.
Not tainted 4.18.0-rc4+ #139
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6 D26296 25719 4553 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:83 [inline]
__percpu_down_read+0x16e/0x210 kernel/locking/percpu-rwsem.c:85
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x2d7/0x300 fs/super.c:1403
sb_start_write include/linux/fs.h:1554 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:386
filename_create+0x13e/0x5b0 fs/namei.c:3640
user_path_create fs/namei.c:3703 [inline]
do_symlinkat+0xfe/0x2d0 fs/namei.c:4157
__do_sys_symlink fs/namei.c:4183 [inline]
__se_sys_symlink fs/namei.c:4181 [inline]
__x64_sys_symlink+0x59/0x80 fs/namei.c:4181
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b57
Code: 80 80 fa 3f 77 10 83 e6 1f c1 e6 06 83 e1 3f 09 ce 83 fe 7f 7f 19 c7 44 24 28 fd ff 00 00 48 ff c0 48 89 44 24 30 48 8b 2c 24 <48> 83 c4 08 c3 89 74 24 28 48 83 c0 02 48 89 44 24 30 48 8b 2c 24
RSP: 002b:00007ffef0ef1968 EFLAGS: 00000217 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000455b57
RDX: 0000000000000000 RSI: 00000000004bb371 RDI: 00007ffef0ef2660
RBP: 0000000000000013 R08: 0000000000000000 R09: 00000000019db940
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffef0ef2010 R15: 00000000007034c0
Showing all locks held in the system:
1 lock held by khungtaskd/901:
#0: 00000000a3a75a36 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461
2 locks held by rs:main Q:Reg/4407:
#0: 00000000ae452158 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
#1: 0000000008e27fd9 (sb_writers#6){++++}, at: file_start_write include/linux/fs.h:2737 [inline]
#1: 0000000008e27fd9 (sb_writers#6){++++}, at: vfs_write+0x452/0x560 fs/read_write.c:548
1 lock held by rsyslogd/4409:
#0: 0000000043ad1682 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
2 locks held by getty/4499:
#0: 00000000180ce60b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 000000005682edd7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4500:
#0: 0000000030702867 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 000000007d04033d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4501:
#0: 0000000014509d87 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 00000000b392f084 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4502:
#0: 000000007f13fcd3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 000000009cf0f04e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4503:
#0: 000000008c08ea75 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 00000000f6fa9f49 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4504:
#0: 00000000762823b4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 000000002921ab64 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4505:
#0: 000000007c3d2abc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 00000000107c66d5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
1 lock held by syz-executor0/4546:
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: sb_start_write include/linux/fs.h:1554 [inline]
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
1 lock held by syz-executor3/4548:
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: sb_start_write include/linux/fs.h:1554 [inline]
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
1 lock held by syz-executor4/4551:
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: sb_start_write include/linux/fs.h:1554 [inline]
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
1 lock held by syz-executor5/4552:
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: sb_start_write include/linux/fs.h:1554 [inline]
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
2 locks held by syz-executor1/25679:
#0: 000000009ee0b20e (&mm->mmap_sem){++++}, at: __do_page_fault+0x389/0xe50 arch/x86/mm/fault.c:1325
#1: 000000005e3a42d6 (sb_pagefaults){++++}, at: sb_start_pagefault include/linux/fs.h:1583 [inline]
#1: 000000005e3a42d6 (sb_pagefaults){++++}, at: ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6126
2 locks held by syz-executor2/25703:
#0: 000000002dcac01f (&mm->mmap_sem){++++}, at: __do_page_fault+0x389/0xe50 arch/x86/mm/fault.c:1325
#1: 000000005e3a42d6 (sb_pagefaults){++++}, at: sb_start_pagefault include/linux/fs.h:1583 [inline]
#1: 000000005e3a42d6 (sb_pagefaults){++++}, at: ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6126
2 locks held by syz-executor7/25716:
#0: 00000000d6203400 (&mm->mmap_sem){++++}, at: __do_page_fault+0x389/0xe50 arch/x86/mm/fault.c:1325
#1: 000000005e3a42d6 (sb_pagefaults){++++}, at: sb_start_pagefault include/linux/fs.h:1583 [inline]
#1: 000000005e3a42d6 (sb_pagefaults){++++}, at: ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6126
1 lock held by syz-executor6/25719:
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: sb_start_write include/linux/fs.h:1554 [inline]
#0: 0000000008e27fd9 (sb_writers#6){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc4+ #139
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+0x1c9/0x2b4 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x151/0x192 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:138 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
watchdog+0x9c4/0xf80 kernel/hung_task.c:252
kthread+0x345/0x410 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54