[ 9002] 0 9002 17634 12722 31 3 0 0 syz-executor4 [ 9005] 0 9005 17667 12754 32 3 0 0 syz-executor2 [ 9009] 0 9009 17667 12754 32 3 0 0 syz-executor2 [ 9032] 0 9032 17634 12691 31 3 0 0 syz-executor4 [ 9034] 0 9034 17634 12691 31 3 0 0 syz-executor4 INFO: task syz-executor5:9368 blocked for more than 140 seconds. Not tainted 4.14.91+ #3 [ 9056] 0 9056 17634 12691 31 3 0 0 syz-executor1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9057] 0 9057 17634 12691 31 3 0 0 syz-executor1 syz-executor5 D27832 9368 1839 0x00000004 [ 9060] 0 9060 17634 12691 31 3 0 0 syz-executor2 Call Trace: [ 9061] 0 9061 17634 12691 31 3 0 0 syz-executor2 [ 9064] 0 9064 17667 12754 32 3 0 0 syz-executor2 [ 9066] 0 9066 17667 12754 32 3 0 0 syz-executor2 [ 9070] 0 9070 17667 12754 31 3 0 0 syz-executor4 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 [ 9072] 0 9072 17667 12754 31 3 0 0 syz-executor4 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3671 [ 9120] 0 9120 17634 12691 31 3 0 0 syz-executor1 [ 9121] 0 9121 17634 12692 31 3 0 0 syz-executor4 [ 9122] 0 9122 17634 12692 31 3 0 0 syz-executor1 [ 9123] 0 9123 17634 12691 31 3 0 0 syz-executor4 [ 9125] 0 9125 17634 12691 31 3 0 0 syz-executor2 Showing all locks held in the system: [ 9127] 0 9127 17634 12691 31 3 0 0 syz-executor2 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/1753: #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 ============================================= [ 9132] 0 9132 17667 12754 31 3 0 0 syz-executor4 [ 9134] 0 9134 17667 12754 32 3 0 0 syz-executor2 [ 9135] 0 9135 17667 12754 32 3 0 0 syz-executor2 [ 9137] 0 9137 17667 12754 31 3 0 0 syz-executor4 NMI backtrace for cpu 0 CPU: 0 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 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: 1772 Comm: syz-fuzzer Not tainted 4.14.91+ #3 task: ffff8881cdef4680 task.stack: ffff8881cc6b0000 RIP: 0010:__lock_release kernel/locking/lockdep.c:3748 [inline] RIP: 0010:lock_release+0x167/0x730 kernel/locking/lockdep.c:4010 RSP: 0000:ffff8881cc6b7060 EFLAGS: 00000002 RAX: 0000000000000003 RBX: 1ffff110398d6e0f RCX: 1ffffffff530229c RDX: 0000000000000004 RSI: 1ffffffff5299285 RDI: ffff8881cdef4eac RBP: ffff8881c92e9508 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8881cdef4f00 R11: 0000000000000001 R12: ffffffffa96d3420 R13: ffff8881cdef4680 R14: ffffea00070e36c0 R15: dffffc0000000000 FS: 000000c420026068(0000) GS:ffff8881d7700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000040320a CR3: 00000001cd648001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:249 [inline] rcu_read_unlock include/linux/rcupdate.h:687 [inline] page_evictable+0x145/0x1f0 mm/vmscan.c:3971 shrink_page_list+0x351/0x32b0 mm/vmscan.c:1000 shrink_inactive_list+0x39a/0x1170 mm/vmscan.c:1816 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: 00f1:0x11 RSP: 15fd6e8:000000c420035fb0 EFLAGS: 00430120 Code: c0 03 0f b6 14 11 65 4c 8b 2c 25 c0 de 01 00 38 d0 7c 08 84 d2 0f 85 8c 04 00 00 44 8b 05 02 42 41 02 45 85 c0 0f 84 1c 02 00 00 <4d> 8d bd 28 08 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 [ 9142] 0 9142 17634 12691 31 3 0 0 syz-executor4