[ 1475] 0 1475 17634 12723 30 3 0 1000 syz-executor2
[ 1519] 0 1519 17634 12723 30 3 0 1000 syz-executor2
[ 1570] 0 1570 17634 12723 30 3 0 1000 syz-executor2
[ 1622] 0 1622 17634 12723 30 3 0 1000 syz-executor2
[ 1682] 0 1682 17634 12723 30 3 0 1000 syz-executor2
INFO: task syz-executor0:22734 blocked for more than 140 seconds.
[ 1751] 0 1751 17634 12723 30 3 0 1000 syz-executor2
Not tainted 4.14.91+ #3
[ 1810] 0 1810 17634 12723 30 3 0 1000 syz-executor2
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D30384 22734 1850 0x00000004
Call Trace:
[ 1882] 0 1882 17667 8461 25 4 0 0 syz-executor0
schedule+0x92/0x1c0 kernel/sched/core.c:3490
__lock_sock+0x12b/0x220 net/core/sock.c:2237
lock_sock_nested+0xe1/0x100 net/core/sock.c:2758
[ 1887] 0 1887 17634 12723 30 3 0 1000 syz-executor2
lock_sock include/net/sock.h:1452 [inline]
packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3671
[ 1926] 0 1926 17634 12723 30 3 0 1000 syz-executor2
[ 1975] 0 1975 17634 12723 30 3 0 1000 syz-executor2
[ 2026] 0 2026 17634 12723 30 3 0 1000 syz-executor2
[ 2070] 0 2070 17634 12723 30 3 0 1000 syz-executor2
[ 2088] 0 2088 17634 12723 30 3 0 1000 syz-executor2
[ 2144] 0 2144 17617 8482 25 4 0 0 syz-executor5
[ 2152] 0 2152 17634 12723 30 3 0 1000 syz-executor2
[ 2216] 0 2216 17634 12723 30 3 0 1000 syz-executor2
[ 2254] 60929 2254 17700 8463 25 4 0 0 syz-executor0
[ 2255] 0 2255 17634 8481 25 4 0 0 syz-executor5
Showing all locks held in the system:
[ 2258] 0 2258 17634 12723 30 3 0 1000 syz-executor2
2 locks held by init/1:
#0: (&mm->mmap_sem){++++}, at: [<ffffffffab6b4391>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354
#1: (&ei->i_mmap_sem){++++}, at: [<ffffffffabd5dfbc>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
[ 2305] 0 2305 17634 12723 30 3 0 1000 syz-executor2
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.?}
[ 2349] 0 2349 17698 8466 25 4 0 0 syz-executor0
, at: [<ffffffffab7ff97c>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541
2 locks held by rs:main Q:Reg/1635:
#0: (&mm->mmap_sem){++++}, at: [<ffffffffab6b4391>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354
#1: (&ei->i_mmap_sem){++++}, at: [<ffffffffabd5dfbc>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
[ 2368] 0 2368 17634 12723 30 3 0 1000 syz-executor2
2 locks held by getty/1765:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffffac336982>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffffac331da7>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
[ 2446] 0 2446 17634 12723 30 3 0 1000 syz-executor2
2 locks held by syz-fuzzer/1796:
#0: (&mm->mmap_sem){++++}, at: [<ffffffffab6b4391>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354
[ 2550] 0 2550 17634 12723 30 3 0 1000 syz-executor2
#1: (&ei->i_mmap_sem){++++}, at: [<ffffffffabd5dfbc>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.91+ #3
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x10e lib/dump_stack.c:53
[ 2605] 0 2605 17634 12723 30 3 0 1000 syz-executor2
nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1638 Comm: rsyslogd Not tainted 4.14.91+ #3
task: ffff8881d0ecaf00 task.stack: ffff8881d0320000
RIP: 0010:debug_lockdep_rcu_enabled.part.0+0x26/0x50 kernel/rcu/update.c:300
RSP: 0000:ffff8881d0327198 EFLAGS: 00000803
RAX: dffffc0000000000 RBX: ffff8881d0ecaf00 RCX: 1ffffffff5b8229c
RDX: 0000000000000000 RSI: 1ffffffff5b19284 RDI: ffff8881d0ecb72c
RBP: ffffffffadad3420 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
FS: 00007f26568e6700(0000) GS:ffff8881d7600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff8480a8dd3 CR3: 00000001d2884002 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
trace_lock_acquire include/trace/events/lock.h:13 [inline]
lock_acquire+0x187/0x380 kernel/locking/lockdep.c:3990
rcu_lock_acquire include/linux/rcupdate.h:244 [inline]
rcu_read_lock include/linux/rcupdate.h:631 [inline]
page_evictable+0x35/0x1f0 mm/vmscan.c:3969
putback_inactive_pages+0x259/0xd50 mm/vmscan.c:1703
shrink_inactive_list+0x4ae/0x1170 mm/vmscan.c:1833
shrink_list mm/vmscan.c:2175 [inline]
shrink_node_memcg+0x5f9/0x1320 mm/vmscan.c:2440
shrink_node+0x2fa/0xbf0 mm/vmscan.c:2632
shrink_zones mm/vmscan.c:2814 [inline]
do_try_to_free_pages+0x350/0xd80 mm/vmscan.c:2876
try_to_free_pages+0x20a/0x6c0 mm/vmscan.c:3082
__perform_reclaim mm/page_alloc.c:3593 [inline]
__alloc_pages_direct_reclaim mm/page_alloc.c:3614 [inline]
__alloc_pages_slowpath mm/page_alloc.c:4001 [inline]
__alloc_pages_nodemask+0xac8/0x22e0 mm/page_alloc.c:4210
__alloc_pages include/linux/gfp.h:461 [inline]
__alloc_pages_node include/linux/gfp.h:474 [inline]
alloc_pages_node include/linux/gfp.h:488 [inline]
__page_cache_alloc include/linux/pagemap.h:226 [inline]
page_cache_read mm/filemap.c:2286 [inline]
filemap_fault+0x900/0x14a0 mm/filemap.c:2470
ext4_filemap_fault+0x84/0xb0 fs/ext4/inode.c:6179
__do_fault+0x80/0x210 mm/memory.c:3194
do_read_fault mm/memory.c:3604 [inline]
do_fault mm/memory.c:3730 [inline]
handle_pte_fault mm/memory.c:3960 [inline]
__handle_mm_fault+0x9a0/0x2640 mm/memory.c:4084
handle_mm_fault+0x2e0/0x6c9 mm/memory.c:4121
__do_page_fault+0x466/0xb80 arch/x86/mm/fault.c:1425
page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1104
RIP: 0009:0x1
RSP: 1903120:0000000000000001 EFLAGS: 7f26500133f0
Code: 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 65 48 8b 1c 25 c0 de 01 00 48 8d bb 2c 08 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 0f 8b 93 2c 08