[25790] 0 25790 17667 8466 27 4 0 0 syz-executor5 [25841] 0 25841 17634 12723 32 3 0 0 syz-executor3 [25865] 0 25865 17667 8466 26 4 0 0 syz-executor5 [25921] 0 25921 17733 8465 26 4 0 0 syz-executor0 INFO: task syz-executor4:933 blocked for more than 140 seconds. Not tainted 4.14.91+ #3 [25936] 0 25936 17634 12723 32 3 0 0 syz-executor3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D29984 933 1858 0x00000004 [25992] 0 25992 17634 12723 32 3 0 0 syz-executor3 Call Trace: [26012] 0 26012 17601 8456 25 4 0 0 syz-executor0 schedule+0x92/0x1c0 kernel/sched/core.c:3490 [26040] 0 26040 17634 12723 32 3 0 0 syz-executor3 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [26083] 0 26083 17634 12723 32 3 0 0 syz-executor3 [26118] 0 26118 17634 8480 25 4 0 0 syz-executor4 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3671 [26150] 0 26150 17634 12723 32 3 0 0 syz-executor3 [26210] 0 26210 17634 12723 32 3 0 0 syz-executor3 [26249] 0 26249 17634 12723 32 3 0 0 syz-executor3 [26266] 0 26266 17667 8444 26 4 0 0 syz-executor0 [26311] 0 26311 17667 8444 26 4 0 0 syz-executor0 [26332] 0 26332 17667 8463 27 4 0 0 syz-executor0 INFO: task syz-executor4:938 blocked for more than 140 seconds. [26362] 0 26362 17634 12723 32 3 0 0 syz-executor3 [26421] 0 26421 17634 12723 32 3 0 0 syz-executor3 Not tainted 4.14.91+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D30528 938 1858 0x00000004 Call Trace: [26426] 0 26426 17601 8233 25 3 0 0 syz-executor0 [26455] 0 26455 17667 8240 27 3 0 0 syz-executor0 schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [26501] 0 26501 17634 12723 32 3 0 0 syz-executor3 [26536] 0 26536 17634 12723 32 3 0 0 syz-executor3 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x592/0x2830 net/packet/af_packet.c:3742 [26555] 0 26555 17667 8478 26 4 0 0 syz-executor1 [26578] 0 26578 17601 8232 24 3 0 0 syz-executor1 [26596] 0 26596 17634 12723 32 3 0 0 syz-executor3 [26607] 0 26607 17667 8233 24 3 0 0 syz-executor1 [26665] 0 26665 17634 12723 32 3 0 0 syz-executor3 [26699] 0 26699 17634 12723 32 3 0 0 syz-executor3 Showing all locks held in the system: [26700] 0 26700 17601 8231 24 3 0 0 syz-executor1 2 locks held by init/1: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 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 cron/1674: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1763: #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 2 locks held by syz-fuzzer/1788: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by syz-fuzzer/1805: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by kworker/u4:8/4943: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 ============================================= [26713] 0 26713 17634 12723 31 3 0 0 syz-executor5 [26721] 0 26721 17701 8237 24 3 0 0 syz-executor1 [26761] 0 26761 17634 12723 32 3 0 0 syz-executor3 [26771] 0 26771 17696 12753 31 3 0 0 syz-executor5 [26907] 0 26907 17634 12723 32 3 0 0 syz-executor3 [26982] 0 26982 17634 12723 32 3 0 0 syz-executor3 [27055] 0 27055 17634 12723 32 3 0 0 syz-executor3 [27137] 0 27137 17634 12723 32 3 0 0 syz-executor3 [27139] 0 27139 17634 12723 31 3 0 0 syz-executor1 [27150] 0 27150 17696 12815 31 3 0 0 syz-executor1 [27168] 0 27168 17634 12723 32 3 0 0 syz-executor3 [27226] 0 27226 17634 12723 32 3 0 0 syz-executor3 NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.91+ #3 [27296] 0 27296 17634 12723 32 3 0 0 syz-executor3 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 [27327] 0 27327 17598 8234 24 3 0 0 syz-executor4 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1674 Comm: cron Not tainted 4.14.91+ #3 task: ffff8881d4652f00 task.stack: ffff8881d4600000 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2358 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2377 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:2431 [inline] RIP: 0010:__lock_acquire+0xbb4/0x3fa0 kernel/locking/lockdep.c:3487 RSP: 0000:ffff8881d4607270 EFLAGS: 00000082 RAX: dffffc0000000000 RBX: ffffffff8e5cf4e0 RCX: 000000007149a6f7 RDX: 1ffffffff1d667ab RSI: ffff8881d46537a8 RDI: ffffffff8e5cf4f8 RBP: ffff8881d4607428 R08: 00000000000056af R09: 0000000000040233 R10: ffff8881d46537a8 R11: 0000000000000000 R12: ffff8881d46537c0 R13: dffffc0000000000 R14: 4bdc7cb99b3c99ed R15: ffff8881d4652f00 FS: 00007fea274197a0(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000417930 CR3: 00000001d5946005 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: ffffffffffffffff DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000050602 Call Trace: Code: 00 00 4a 8b 1c c5 e0 87 b0 8e 48 85 db 74 57 48 83 eb 08 74 51 49 bd 00 00 00 00 00 fc ff df eb 06 48 83 eb 08 74 3f 48 8d 7b 18 <48> 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 26 1f 00 00 4c 3b 73