[ 5917] 0 5917 17585 8234 24 3 0 0 syz-executor2 [ 5920] 0 5920 17651 8442 27 4 0 0 syz-executor3 [ 5922] 0 5922 17618 8412 25 4 0 0 syz-executor2 [ 5951] 0 5951 17585 8438 23 3 0 0 syz-executor5 [ 5992] 0 5992 17618 12973 32 3 0 1000 syz-executor0 INFO: task syz-executor4:8572 blocked for more than 140 seconds. Not tainted 4.14.89+ #26 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D26968 8572 1853 0x10000004 Call Trace: [ 5993] 0 5993 17651 8471 25 4 0 0 syz-executor4 [ 6004] 0 6004 17684 8446 25 3 0 0 syz-executor5 schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __lock_sock+0x11d/0x210 net/core/sock.c:2237 [ 6035] 0 6035 17618 8442 25 4 0 0 syz-executor5 [ 6063] 0 6063 17618 12973 32 3 0 1000 syz-executor0 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x4d8/0x2680 net/packet/af_packet.c:3671 [ 6077] 0 6077 17585 8460 24 4 0 0 syz-executor4 [ 6080] 0 6080 17585 8439 24 3 0 0 syz-executor5 [ 6083] 0 6083 17618 8443 25 4 0 0 syz-executor5 [ 6131] 0 6131 17618 12973 32 3 0 1000 syz-executor0 [ 6152] 0 6152 17618 8465 25 4 0 0 syz-executor4 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 [ 6241] 0 6241 17618 12973 32 3 0 1000 syz-executor0 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457669 RSP: 002b:00007f326a224c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457669 [ 6307] 0 6307 17618 12973 32 3 0 1000 syz-executor0 RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000009 RBP: 000000000072c040 R08: 000000000000001c R09: 0000000000000000 R10: 0000000020000040 R11: 0000000000000246 R12: 00007f326a2256d4 [ 6327] 0 6327 17585 8222 23 3 0 1000 syz-executor1 R13: 00000000004c4eba R14: 00000000004d8f70 R15: 00000000ffffffff Showing all locks held in the system: [ 6328] 0 6328 17585 8231 24 3 0 1000 syz-executor1 2 locks held by init/1: #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 [ 6348] 0 6348 17684 8433 26 4 0 0 syz-executor2 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 rs:main Q:Reg/1634: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 [ 6383] 0 6383 17618 12973 32 3 0 1000 syz-executor0 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 2 locks held by rsyslogd/1635: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 [ 6403] 0 6403 17618 8409 25 4 0 1000 syz-executor1 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1764: #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/u4:10/14246: #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 2 locks held by kworker/u4:20/17474: #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 2 locks held by udevd/30042: #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 1 lock held by syz-executor4/8550: [ 6439] 0 6439 17618 12973 32 3 0 1000 syz-executor0 #0: (sk_lock-AF_PACKET){+.+.}, at: [] lock_sock include/net/sock.h:1452 [inline] #0: (sk_lock-AF_PACKET){+.+.}, at: [] packet_setsockopt+0x4d8/0x2680 net/packet/af_packet.c:3671 2 locks held by modprobe/8576: #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 blkid/8579: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 [ 6462] 65534 6462 17585 8231 24 3 0 1000 syz-executor1 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 ============================================= [ 6478] 65534 6478 17651 8238 25 3 0 1000 syz-executor1 [ 6513] 0 6513 17618 12973 32 3 0 1000 syz-executor0 [ 6565] 0 6565 17618 12973 32 3 0 1000 syz-executor0 NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.89+ #26 Call Trace: [ 6637] 0 6637 17618 12973 32 3 0 1000 syz-executor0 __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 [ 6675] 0 6675 17618 12973 32 3 0 1000 syz-executor0 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: 1783 Comm: syz-fuzzer Not tainted 4.14.89+ #26 task: ffff8881d15b5e00 task.stack: ffff8881d1fc8000 RIP: 0010:list_lru_from_memcg_idx mm/list_lru.c:59 [inline] RIP: 0010:__list_lru_count_one mm/list_lru.c:172 [inline] RIP: 0010:list_lru_count_one+0x15b/0x1d0 mm/list_lru.c:182 RSP: 0000:ffff8881d1fcf498 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8881c9e3cf00 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffff8881d15b66a8 RDI: ffffffffbac11680 RBP: ffffffffffffffff R08: 0000000000003fe6 R09: ffffffffbbaec710 R10: ffff8881d15b66a8 R11: 0000000000000001 R12: ffff8881a10baa00 R13: ffff8881d1fcf5c0 R14: ffff8881d1fcf5c8 R15: 0000000000000000 FS: 000000c420026068(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f71f8240ca0 CR3: 00000001d17a4003 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+0x18a/0x2a0 fs/super.c:144 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: e8 5d 41 5c c3 e8 c6 17 e5 ff 49 8d 3c ec 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 6e 49 8b 2c ec eb a2 a0 17 e5 ff 48 8d 7b 18 be ff ff ff ff e8 02 b8 d3 ff 85 c0