[31404] 0 31404 18146 13234 33 3 0 1000 syz-executor3 [31449] 0 31449 18146 13234 33 3 0 1000 syz-executor3 [31510] 0 31510 18146 13234 33 3 0 1000 syz-executor3 [31566] 0 31566 18146 13234 33 3 0 1000 syz-executor3 [31608] 0 31608 18113 8744 26 4 0 0 syz-executor0 INFO: task syz-executor0:16933 blocked for more than 140 seconds. Not tainted 4.14.97+ #1 [31612] 0 31612 18146 13234 33 3 0 1000 syz-executor3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [31653] 0 31653 18146 13234 33 3 0 1000 syz-executor3 syz-executor0 D30528 16933 10099 0x00000004 [31733] 0 31733 18146 13234 33 3 0 1000 syz-executor3 [31766] 0 31766 18146 13234 33 3 0 1000 syz-executor3 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2238 [31818] 0 31818 18113 8746 26 4 0 0 syz-executor4 [31826] 0 31826 18146 8748 26 4 0 0 syz-executor4 lock_sock_nested+0xe1/0x100 net/core/sock.c:2762 lock_sock include/net/sock.h:1456 [inline] packet_setsockopt+0x4b7/0x2830 net/packet/af_packet.c:3798 [31844] 0 31844 18146 13234 33 3 0 1000 syz-executor3 [31888] 0 31888 18146 13234 33 3 0 1000 syz-executor3 [31935] 0 31935 18146 13234 33 3 0 1000 syz-executor3 [31968] 0 31968 18110 8715 26 3 0 0 syz-executor5 [31971] 0 31971 18146 13234 33 3 0 1000 syz-executor3 [31972] 0 31972 18143 8717 26 3 0 0 syz-executor5 [32022] 0 32022 18146 13234 33 3 0 1000 syz-executor3 [32025] 0 32025 18113 8714 25 3 0 0 syz-executor4 [32028] 0 32028 18146 8716 25 3 0 0 syz-executor4 [32071] 0 32071 18146 13234 33 3 0 1000 syz-executor3 [32119] 0 32119 18146 13234 33 3 0 1000 syz-executor3 Showing all locks held in the system: [32133] 0 32133 18146 8707 25 3 0 0 syz-executor5 2 locks held by init/1: [32135] 0 32135 18146 8718 25 3 0 0 syz-executor5 [32147] 0 32147 18113 8744 26 4 0 0 syz-executor0 [32149] 0 32149 18113 8704 24 3 0 0 syz-executor5 [32152] 0 32152 18146 13234 33 3 0 1000 syz-executor3 [32177] 0 32177 18113 8714 25 3 0 0 syz-executor4 [32181] 0 32181 18113 8715 26 3 0 0 syz-executor4 [32183] 0 32183 18146 8718 26 3 0 0 syz-executor4 [32187] 0 32187 18146 8718 26 3 0 0 syz-executor4 [32197] 0 32197 18146 13234 33 3 0 1000 syz-executor3 [32250] 0 32250 18146 13234 33 3 0 1000 syz-executor3 [32311] 0 32311 18146 13234 33 3 0 1000 syz-executor3 #0: ( [32351] 0 32351 18146 13234 33 3 0 1000 syz-executor3 &mm->mmap_sem [32359] 0 32359 18212 8737 26 4 0 0 syz-executor4 ){++++} [32385] 0 32385 18212 8737 26 4 0 0 syz-executor4 [32390] 0 32390 18146 13234 33 3 0 1000 syz-executor3 , at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 [32455] 0 32455 18146 13234 33 3 0 1000 syz-executor3 #1: [32487] 0 32487 18146 13234 33 3 0 1000 syz-executor3 ( [32541] 0 32541 18146 13234 33 3 0 1000 syz-executor3 &ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6184 1 lock held by khungtaskd/23: [32586] 0 32586 18146 13234 33 3 0 1000 syz-executor3 #0: [32624] 0 32624 18179 8733 26 4 0 0 syz-executor4 (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1764: #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/1789: #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:6184 [32630] 0 32630 18146 13234 33 3 0 1000 syz-executor3 2 locks held by syz-fuzzer/1802: #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:6184 2 locks held by syz-executor2/10203: #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:6184 2 locks held by udevd/11094: #0: (&p->lock){+.+.}, at: [] seq_read+0xcd/0x1180 fs/seq_file.c:165 [32655] 0 32655 18179 8733 26 4 0 0 syz-executor4 #1: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 2 locks held by kworker/u4:9/12994: #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 ============================================= [32678] 0 32678 18146 13234 33 3 0 1000 syz-executor3 [32745] 0 32745 18146 13234 33 3 0 1000 syz-executor3 [ 335] 0 335 18146 13234 33 3 0 1000 syz-executor3 [ 359] 0 359 18212 8751 26 4 0 0 syz-executor5 [ 384] 0 384 18179 8748 26 4 0 0 syz-executor0 [ 392] 0 392 18146 13234 33 3 0 1000 syz-executor3 NMI backtrace for cpu 0 [ 444] 0 444 18146 13234 33 3 0 1000 syz-executor3 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.97+ #1 [ 473] 0 473 18179 8732 26 4 0 0 syz-executor0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 [ 507] 0 507 18146 13234 33 3 0 1000 syz-executor3 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 [ 518] 0 518 18179 8732 26 4 0 0 syz-executor0 [ 542] 0 542 18179 8749 26 4 0 0 syz-executor5 [ 557] 0 557 18146 13234 33 3 0 1000 syz-executor3 [ 593] 0 593 18179 8751 27 4 0 0 syz-executor4 [ 625] 0 625 18146 13234 33 3 0 1000 syz-executor3 [ 676] 0 676 18146 13234 33 3 0 1000 syz-executor3 Sending NMI from CPU 0 to CPUs 1: [ 709] 0 709 18146 13234 33 3 0 1000 syz-executor3 NMI backtrace for cpu 1 CPU: 1 PID: 16942 Comm: modprobe Not tainted 4.14.97+ #1 task: ffff8881a435c680 task.stack: ffff88806e500000 RIP: 0010:io_serial_out+0x68/0x80 drivers/tty/serial/8250/8250_port.c:457 RSP: 0000:ffff88806e507508 EFLAGS: 00000002 RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: 0000000000000000 RDI: ffffffff9a763cd8 RBP: ffffffff9a763ca0 R08: 00000000000012f3 R09: 00000000000c0037 R10: ffff8881a435cfc8 R11: 0000000000000001 R12: 000000000000005b R13: ffffffff9a763ca0 R14: dffffc0000000000 R15: ffffffff99df3131 FS: 00007f2bab82f700(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000124b040 CR3: 0000000100228005 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: uart_console_write+0x47/0xd0 drivers/tty/serial/serial_core.c:1897 serial8250_console_write+0x2d9/0x820 drivers/tty/serial/8250/8250_port.c:3250 call_console_drivers kernel/printk/printk.c:1719 [inline] console_unlock+0x6d9/0xc60 kernel/printk/printk.c:2391 vprintk_emit+0x128/0x330 kernel/printk/printk.c:1917 vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401 printk+0xba/0xed kernel/printk/printk.c:1990 dump_tasks mm/oom_kill.c:396 [inline] dump_header+0x6d8/0x775 mm/oom_kill.c:428 oom_kill_process.cold+0x10/0xc29 mm/oom_kill.c:861 Code: 8d d1 00 00 00 48 8d 7d 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 15 03 5d 38 44 89 e0 89 da ee <5b> 5d 41 5c c3 e8 be 82 7c ff eb c7 e8 e7 82 7c ff eb e4 0f 1f