[ 2337] 0 2337 17634 12724 31 3 0 0 syz-executor2 [ 2376] 0 2376 17601 8235 26 3 0 0 syz-executor1 [ 2384] 0 2384 17634 12724 31 3 0 0 syz-executor2 [ 2413] 0 2413 17700 12820 31 3 0 0 syz-executor1 [ 2431] 0 2431 17634 12724 31 3 0 0 syz-executor2 INFO: task syz-executor1:17940 blocked for more than 140 seconds. [ 2466] 0 2466 17634 12989 31 3 0 0 syz-executor3 [ 2494] 0 2494 17634 12724 31 3 0 0 syz-executor2 Not tainted 4.14.90+ #29 [ 2541] 0 2541 17601 8231 24 3 0 0 syz-executor5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 2558] 0 2558 17634 12724 31 3 0 0 syz-executor2 [ 2577] 0 2577 17602 8231 24 3 0 0 syz-executor5 [ 2580] 0 2580 17634 8234 25 3 0 0 syz-executor5 [ 2607] 0 2607 17601 8456 25 4 0 0 syz-executor3 syz-executor1 D [ 2623] 0 2623 17634 12724 31 3 0 0 syz-executor2 30376 17940 1853 0x00000004 [ 2662] 0 2662 17601 8232 24 3 0 0 syz-executor5 Call Trace: [ 2666] 0 2666 17634 12724 31 3 0 0 syz-executor2 [ 2669] 0 2669 17700 8238 24 3 0 0 syz-executor5 [ 2727] 0 2727 17634 12724 31 3 0 0 syz-executor2 [ 2774] 0 2774 17634 12724 31 3 0 0 syz-executor2 schedule+0x7f/0x1b0 kernel/sched/core.c:3490 [ 2794] 0 2794 17601 8223 23 3 0 0 syz-executor4 __lock_sock+0x11d/0x210 net/core/sock.c:2237 [ 2798] 0 2798 17601 8234 24 3 0 0 syz-executor4 [ 2852] 0 2852 17634 8461 25 3 0 0 syz-executor3 [ 2858] 0 2858 17700 8467 25 3 0 0 syz-executor3 [ 2860] 0 2860 17634 12724 31 3 0 0 syz-executor2 [ 2886] 0 2886 17634 12724 31 3 0 0 syz-executor2 [ 2903] 0 2903 17667 8444 25 4 0 0 syz-executor4 [ 2923] 0 2923 17634 12724 31 3 0 0 syz-executor2 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 [ 2935] 0 2935 17667 17601 41 4 0 0 syz-executor0 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x5e8/0x2680 net/packet/af_packet.c:3780 [ 3000] 0 3000 17668 8445 25 4 0 0 syz-executor1 [ 3013] 0 3013 17700 12553 32 4 0 0 syz-executor3 [ 3028] 0 3028 17634 12724 31 3 0 0 syz-executor2 [ 3074] 0 3074 17601 8441 25 4 0 0 syz-executor1 [ 3100] 0 3100 17601 8233 24 3 0 0 syz-executor1 [ 3102] 0 3102 17634 12724 31 3 0 0 syz-executor2 [ 3104] 0 3104 17634 8235 24 3 0 0 syz-executor1 [ 3141] 0 3141 17634 12724 31 3 0 0 syz-executor2 [ 3153] 0 3153 17668 8477 26 4 0 0 syz-executor0 [ 3213] 0 3213 17634 12724 31 3 0 0 syz-executor2 [ 3217] 0 3217 17668 8477 26 4 0 0 syz-executor0 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 [ 3253] 0 3253 17601 8458 25 4 0 0 syz-executor3 [ 3273] 0 3273 17634 12724 31 3 0 0 syz-executor2 [ 3329] 0 3329 17634 12724 31 3 0 0 syz-executor2 [ 3390] 0 3390 17634 12724 31 3 0 0 syz-executor2 [ 3428] 0 3428 17634 12724 31 3 0 0 syz-executor2 [ 3484] 0 3484 17634 12724 31 3 0 0 syz-executor2 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 [ 3542] 0 3542 17700 8237 24 3 0 0 syz-executor5 entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 3559] 0 3559 17634 12724 31 3 0 0 syz-executor2 RIP: 0033:0x4579b9 [ 3604] 0 3604 17634 12724 31 3 0 0 syz-executor2 RSP: 002b:00007f6566ef1c78 EFLAGS: 00000246 [ 3618] 0 3618 17634 8462 25 4 0 0 syz-executor5 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004579b9 RDX: 0000000000000008 RSI: 0000000000000107 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000000000004 R09: 0000000000000000 [ 3663] 0 3663 17634 12724 31 3 0 0 syz-executor2 R10: 0000000020000080 R11: 0000000000000246 R12: 00007f6566ef26d4 R13: 00000000004c5805 R14: 00000000004da080 R15: 00000000ffffffff [ 3794] 0 3794 17634 12724 31 3 0 0 syz-executor2 Showing all locks held in the system: [ 3872] 0 3872 17634 12724 31 3 0 0 syz-executor2 2 locks held by init/1: [ 3949] 0 3949 17601 8233 24 3 0 0 syz-executor1 #0: [ 3952] 0 3952 17634 8235 24 3 0 0 syz-executor1 [ 3956] 0 3956 17700 8449 26 4 0 0 syz-executor4 [ 3976] 0 3976 17601 8233 24 3 0 0 syz-executor1 [ 3978] 0 3978 17700 8449 26 4 0 0 syz-executor4 ( [ 3980] 0 3980 17634 8443 25 4 0 0 syz-executor1 &mm->mmap_sem){++++} [ 3983] 0 3983 17634 8235 24 3 0 0 syz-executor1 , at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 [ 3994] 0 3994 17634 12724 31 3 0 0 syz-executor2 #1: [ 4040] 0 4040 17634 8442 25 4 0 0 syz-executor4 ( [ 4050] 0 4050 17634 12724 31 3 0 0 syz-executor2 &ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by rsyslogd/1626: [ 4073] 0 4073 17634 12724 31 3 0 0 syz-executor2 #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1754: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x1700 drivers/tty/n_tty.c:2156 2 locks held by kworker/u4:4/3730: [ 4146] 0 4146 17634 8472 26 4 0 0 syz-executor0 #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.90+ #29 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1779 Comm: syz-fuzzer Not tainted 4.14.90+ #29 task: ffff8881ce474680 task.stack: ffff8881cbd60000 RIP: 0010:spin_lock include/linux/spinlock.h:317 [inline] RIP: 0010:__list_lru_count_one mm/list_lru.c:171 [inline] RIP: 0010:list_lru_count_one+0x77/0x1d0 mm/list_lru.c:182 RSP: 0000:ffff8881cbd67498 EFLAGS: 00000282 RAX: dffffc0000000000 RBX: ffff8881c79da480 RCX: 1ffff110397aceb8 RDX: 1ffff110335b8538 RSI: 0000000000000000 RDI: ffff88819adc29c0 RBP: ffffffffffffffff R08: 0000000000000001 R09: 0000000000000000 R10: ffff8881ce474f28 R11: 0000000000000001 R12: ffff88819adc29c0 R13: ffff8881cbd675c0 R14: ffff8881cbd675c8 R15: 0000000000000000 FS: 000000c420026068(0000) GS:ffff8881d7700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6671c4ab10 CR3: 00000001cc7a2001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: list_lru_shrink_count include/linux/list_lru.h:117 [inline] super_cache_count+0x139/0x2a0 fs/super.c:143 do_shrink_slab mm/vmscan.c:328 [inline] shrink_slab.part.8+0x25c/0xa30 mm/vmscan.c:504 shrink_slab mm/vmscan.c:468 [inline] shrink_node+0x8c8/0xbf0 mm/vmscan.c:2665 shrink_zones mm/vmscan.c:2812 [inline] do_try_to_free_pages+0x349/0xde0 mm/vmscan.c:2874 try_to_free_pages+0x204/0x6b0 mm/vmscan.c:3080 __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+0xa8a/0x2180 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+0xcdd/0x14a0 mm/filemap.c:2470 ext4_filemap_fault+0x7d/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+0x991/0x25f0 mm/memory.c:4084 handle_mm_fault+0x2f2/0x6eb mm/memory.c:4121 __do_page_fault+0x45d/0xb60 arch/x86/mm/fault.c:1425 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1104 RIP: 00f1:0x11 RSP: 000b:000000c420035fb0 EFLAGS: 00430120 Code: 04 00 00 e8 bc 17 e5 ff 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 33 01 00 00 48 c1 e3 07 49 03 1c 24 <48> 89 df e8 01 dd 3a 01 48 c7 c7 80 16 81 ad 48 b8 00 00 00 00