[18006] 0 18006 17651 8233 24 3 0 1000 syz-executor5 [18024] 0 18024 17585 8229 24 3 0 1000 syz-executor5 [18041] 0 18041 17585 8229 24 3 0 1000 syz-executor5 [18047] 0 18047 17618 8231 24 3 0 1000 syz-executor5 INFO: task syz-executor2:7980 blocked for more than 140 seconds. Not tainted 4.14.90+ #29 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [18051] 0 18051 17618 12709 30 3 0 1000 syz-executor2 syz-executor2 D30376 7980 1843 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __lock_sock+0x11d/0x210 net/core/sock.c:2237 [18071] 0 18071 17585 8229 24 3 0 1000 syz-executor5 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x7be/0x2680 net/packet/af_packet.c:3742 [18079] 0 18079 17618 8231 24 3 0 1000 syz-executor5 [18094] 0 18094 17585 8228 23 3 0 1000 syz-executor5 [18101] 0 18101 17684 8415 26 4 0 0 syz-executor3 [18103] 0 18103 17585 8229 24 3 0 1000 syz-executor5 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 [18108] 0 18108 17618 8231 24 3 0 1000 syz-executor5 [18113] 0 18113 17651 8233 24 3 0 1000 syz-executor5 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 [18119] 0 18119 17618 12709 30 3 0 1000 syz-executor2 entry_SYSCALL_64_after_hwframe+0x42/0xb7 [18144] 0 18144 17618 8407 25 4 0 1000 syz-executor5 RIP: 0033:0x457669 RSP: 002b:00007f8a730cec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [18148] 0 18148 17585 8229 24 3 0 1000 syz-executor5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457669 [18168] 0 18168 17585 8405 25 4 0 1000 syz-executor5 RDX: 000000000000000c RSI: 0000000000000107 RDI: 0000000000000003 [18171] 0 18171 17585 8229 24 3 0 1000 syz-executor5 RBP: 000000000072bfa0 R08: 0000000000000004 R09: 0000000000000000 [18179] 0 18179 17584 8229 24 3 0 1000 syz-executor5 R10: 0000000020000180 R11: 0000000000000246 R12: 00007f8a730cf6d4 R13: 00000000004c4ea4 R14: 00000000004d8f58 R15: 00000000ffffffff Showing all locks held in the system: [18186] 0 18186 17617 8231 24 3 0 1000 syz-executor5 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/1628: [18193] 0 18193 17618 8407 25 4 0 1000 syz-executor5 #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 rsyslogd/1629: #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 getty/1758: #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 [18199] 0 18199 17618 12709 30 3 0 1000 syz-executor2 ============================================= [18222] 0 18222 17585 8229 24 3 0 1000 syz-executor5 [18233] 0 18233 17618 8407 25 4 0 1000 syz-executor5 [18236] 0 18236 17585 8229 24 3 0 1000 syz-executor5 [18243] 0 18243 17618 8407 25 4 0 1000 syz-executor5 [18257] 0 18257 17618 12709 30 3 0 1000 syz-executor2 [18277] 0 18277 17618 8407 25 4 0 1000 syz-executor5 [18280] 0 18280 17585 8229 24 3 0 1000 syz-executor5 [18288] 0 18288 17618 8407 25 4 0 1000 syz-executor5 [18295] 0 18295 17585 8229 24 3 0 1000 syz-executor5 NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.90+ #29 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 [18313] 0 18313 17618 8407 25 4 0 1000 syz-executor5 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 [18317] 0 18317 17585 8229 24 3 0 1000 syz-executor5 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 0 to CPUs 1: [18332] 0 18332 17618 12709 30 3 0 1000 syz-executor2 NMI backtrace for cpu 1 CPU: 1 PID: 1 Comm: init Not tainted 4.14.90+ #29 task: ffff8881da9d0000 task.stack: ffff8881da9d8000 RIP: 0010:io_serial_in+0x60/0x80 drivers/tty/serial/8250/8250_port.c:450 RSP: 0000:ffff8881da9df318 EFLAGS: 00000006 RAX: dffffc0000000005 RBX: 00000000000003f9 RCX: 0000000000000000 RDX: 00000000000003f9 RSI: 0000000000000001 RDI: ffffffffb8327cd8 RBP: ffffffffb8327ca0 R08: 0000000000003f05 R09: ffffffffb74ec008 R10: ffff8881da9d0970 R11: 0000000000000001 R12: ffffffffb8327eb8 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffffb8327ce8 FS: 00007f7116b797a0(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000438ed0 CR3: 00000001d0cc6001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: serial_port_in include/linux/serial_core.h:260 [inline] serial8250_console_write+0x1cc/0x800 drivers/tty/serial/8250/8250_port.c:3237 call_console_drivers kernel/printk/printk.c:1719 [inline] console_unlock+0x6d3/0xc80 kernel/printk/printk.c:2391 vprintk_emit+0x125/0x320 kernel/printk/printk.c:1917 vprintk_func+0x58/0x159 kernel/printk/printk_safe.c:401 printk+0xa7/0xcf kernel/printk/printk.c:1990 dump_tasks mm/oom_kill.c:396 [inline] dump_header+0x70b/0x7a8 mm/oom_kill.c:428 oom_kill_process.cold.8+0x10/0xc88 mm/oom_kill.c:861 out_of_memory+0x669/0xa60 mm/oom_kill.c:1075 __alloc_pages_may_oom mm/page_alloc.c:3356 [inline] __alloc_pages_slowpath mm/page_alloc.c:4045 [inline] __alloc_pages_nodemask+0x182f/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] pte_alloc_one+0x18/0xf0 arch/x86/mm/pgtable.c:30 __pte_alloc+0x21/0x270 mm/memory.c:656 copy_pte_range mm/memory.c:1081 [inline] copy_pmd_range mm/memory.c:1157 [inline] copy_pud_range mm/memory.c:1191 [inline] copy_p4d_range mm/memory.c:1213 [inline] copy_page_range+0xfba/0x1810 mm/memory.c:1275 dup_mmap kernel/fork.c:717 [inline] dup_mm kernel/fork.c:1202 [inline] copy_mm kernel/fork.c:1256 [inline] copy_process.part.6+0x439c/0x6530 kernel/fork.c:1762 copy_process kernel/fork.c:1573 [inline] _do_fork+0x1c2/0xd50 kernel/fork.c:2054 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f7116224f46 RSP: 002b:00007ffe90343370 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffe90343370 RCX: 00007f7116224f46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffe903433b0 R08: 0000000000000000 R09: 0000000000000001 R10: 00007f7116b79a70 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffe90343500 R15: 0000000001c9d1b8 Code: 30 0f b6 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 13 03 5d 38 89 da ec <0f> b6 c0 5b 5d c3 e8 95 53 7c ff eb c9 e8 be 53 7c ff eb e6 66