[10909] 0 10909 18212 8996 28 4 0 0 syz-executor0 [11071] 0 11071 18113 8743 25 3 0 0 syz-executor5 [11080] 0 11080 18212 8974 27 4 0 0 syz-executor5 [11083] 0 11083 18113 8744 25 3 0 0 syz-executor5 [11104] 0 11104 18179 8748 26 3 0 0 syz-executor5 INFO: task syz-executor2:4604 blocked for more than 140 seconds. Not tainted 4.14.94+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [11107] 0 11107 18179 8748 26 3 0 0 syz-executor5 syz-executor2 D28952 4604 1833 0x00000004 [11127] 0 11127 18113 8743 25 3 0 0 syz-executor2 Call Trace: [11129] 0 11129 18113 8743 25 3 0 0 syz-executor5 schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [11147] 0 11147 18113 8744 25 3 0 0 syz-executor2 [11153] 0 11153 18146 8746 25 3 0 0 syz-executor5 lock_sock_nested+0xe1/0x100 net/core/sock.c:2761 lock_sock include/net/sock.h:1456 [inline] packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3675 [11162] 0 11162 18113 8989 26 4 0 0 syz-executor0 [11176] 0 11176 18113 8743 25 3 0 0 syz-executor2 [11178] 0 11178 18113 8968 26 4 0 0 syz-executor2 [11182] 0 11182 18113 8744 25 3 0 0 syz-executor2 [11197] 0 11197 18113 8743 25 3 0 0 syz-executor5 [11202] 0 11202 18113 8743 25 3 0 0 syz-executor2 INFO: task syz-executor2:4624 blocked for more than 140 seconds. [11213] 0 11213 18113 8744 25 3 0 0 syz-executor5 [11222] 0 11222 18146 8746 25 3 0 0 syz-executor2 Not tainted 4.14.94+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [11237] 0 11237 18113 8743 25 3 0 0 syz-executor5 syz-executor2 D29984 4624 1833 0x00000004 Call Trace: [11250] 0 11250 18146 8746 25 3 0 0 syz-executor5 [11412] 0 11412 18179 8747 26 3 0 0 syz-executor2 schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [11434] 0 11434 18212 8749 32 3 0 0 syz-executor2 [11589] 0 11589 18245 13070 34 4 0 0 syz-executor2 [11782] 0 11782 18179 8989 26 4 0 0 syz-executor0 lock_sock_nested+0xe1/0x100 net/core/sock.c:2761 lock_sock include/net/sock.h:1456 [inline] packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3675 [11785] 0 11785 18179 8989 26 4 0 0 syz-executor0 [12159] 0 12159 18113 8743 25 3 0 0 syz-executor0 [12455] 0 12455 18212 8992 26 4 0 0 syz-executor3 [12692] 0 12692 18146 13235 32 3 0 0 syz-executor0 [12799] 0 12799 18146 13235 32 3 0 0 syz-executor0 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1747: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 ============================================= [12850] 0 12850 18146 13235 32 3 0 0 syz-executor0 [12899] 0 12899 18146 13235 32 3 0 0 syz-executor0 [12978] 0 12978 18146 13235 32 3 0 0 syz-executor0 [12997] 0 12997 18113 8743 24 3 0 0 syz-executor3 [13030] 0 13030 18146 13235 32 3 0 0 syz-executor0 [13075] 0 13075 18146 13235 32 3 0 0 syz-executor0 [13124] 0 13124 18146 13235 32 3 0 0 syz-executor0 NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.94+ #10 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1781 Comm: syz-fuzzer Not tainted 4.14.94+ #10 task: ffff8881cdeaaf00 task.stack: ffff8881cb998000 RIP: 0010:__lock_acquire+0x41a/0x3fa0 kernel/locking/lockdep.c:3442 RSP: 0000:ffff8881cb99f260 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 0000000000040000 RCX: 0000000000000000 RDX: 1ffff11039bd56f9 RSI: 0000000000000000 RDI: ffff8881cdeab7cc RBP: ffff8881cb99f420 R08: 0000000000000001 R09: 0000000000040231 R10: ffff8881cdeab7a8 R11: 1ffff11039bd56f4 R12: ffff8881cdeab7c0 R13: 0000000000000231 R14: 0000000000000003 R15: ffff8881cdeaaf00 FS: 000000c420108068(0000) GS:ffff8881d7500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f039acdddd3 CR3: 00000001cca4c003 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x10f/0x380 kernel/locking/lockdep.c:3991 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] __list_lru_count_one mm/list_lru.c:171 [inline] list_lru_count_one+0x7f/0x1d0 mm/list_lru.c:182 list_lru_shrink_count include/linux/list_lru.h:117 [inline] super_cache_count+0x133/0x2b0 fs/super.c:143 do_shrink_slab mm/vmscan.c:328 [inline] shrink_slab.part.0+0x251/0xa40 mm/vmscan.c:504 shrink_slab mm/vmscan.c:468 [inline] shrink_node+0x8b5/0xbf0 mm/vmscan.c:2667 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:6185 __do_fault+0x100/0x380 mm/memory.c:3217 do_read_fault mm/memory.c:3627 [inline] do_fault mm/memory.c:3753 [inline] handle_pte_fault mm/memory.c:3983 [inline] __handle_mm_fault+0x9a0/0x2640 mm/memory.c:4107 handle_mm_fault+0x2e0/0x6c9 mm/memory.c:4144 __do_page_fault+0x466/0xb80 arch/x86/mm/fault.c:1425 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1104 RIP: 2eab32c0:0x1 RSP: 0000:000000c420023fd0 EFLAGS: 00000001 Code: 12 81 e3 00 00 04 00 09 d9 25 ff 1f 00 00 41 09 c9 8b 4d 20 c1 e1 14 41 09 c9 41 09 c1 48 b8 00 00 00 00 00 fc ff df 45 89 4a 20 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 [13197] 0 13197 18146 13235 32 3 0 0 syz-executor0