[ 876] 0 876 17618 12709 31 3 0 1000 syz-executor3 [ 926] 0 926 17651 8434 26 4 0 0 syz-executor0 [ 999] 0 999 17651 8413 26 4 0 0 syz-executor5 [ 1004] 0 1004 17651 8396 25 4 0 0 syz-executor2 [ 1046] 0 1046 17651 8413 26 4 0 0 syz-executor5 INFO: task syz-executor5:21078 blocked for more than 140 seconds. Not tainted 4.14.90+ #29 [ 1097] 0 1097 17585 8233 25 3 0 0 syz-executor2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1102] 0 1102 17717 8241 25 3 0 0 syz-executor2 syz-executor5 D30248 21078 1846 0x00000004 Call Trace: [ 1263] 0 1263 17617 8232 24 3 0 0 syz-executor2 [ 1265] 0 1265 17650 8413 25 4 0 0 syz-executor2 [ 1276] 0 1276 17618 8428 26 4 0 0 syz-executor5 schedule+0x7f/0x1b0 kernel/sched/core.c:3490 [ 1367] 0 1367 17651 8409 25 4 0 1000 syz-executor3 __lock_sock+0x11d/0x210 net/core/sock.c:2237 [ 1441] 0 1441 5593 372 14 3 0 -1000 udevd lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 [ 1506] 0 1506 17585 8232 25 3 0 0 syz-executor0 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x4d8/0x2680 net/packet/af_packet.c:3671 [ 1507] 0 1507 17651 8412 26 4 0 1000 syz-executor3 [ 1531] 0 1531 17618 8234 25 3 0 0 syz-executor0 [ 1607] 0 1607 17651 8414 26 4 0 0 syz-executor1 [ 1824] 0 1824 17585 8229 24 3 0 1000 syz-executor3 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 [ 1830] 0 1830 17651 8233 24 3 0 1000 syz-executor3 [ 1879] 0 1879 17651 8410 26 4 0 0 syz-executor1 [ 1908] 0 1908 17585 8232 24 3 0 0 syz-executor2 [ 1913] 0 1913 17618 8234 24 3 0 0 syz-executor2 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457669 [ 2024] 0 2024 17618 8427 26 4 0 0 syz-executor5 RSP: 002b:00007f6e751ecc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457669 RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000003 [ 2089] 0 2089 17684 8435 26 4 0 0 syz-executor0 RBP: 000000000072bfa0 R08: 0000000000000010 R09: 0000000000000000 [ 2111] 0 2111 17684 8435 26 4 0 0 syz-executor0 [ 2123] 0 2123 17618 8431 26 4 0 0 syz-executor0 R10: 0000000020000080 R11: 0000000000000246 R12: 00007f6e751ed6d4 [ 2272] 0 2272 17816 8443 33 4 0 0 syz-executor5 [ 2274] 0 2274 17585 8229 23 3 0 0 syz-executor1 R13: 00000000004c4eba R14: 00000000004d8f70 R15: 00000000ffffffff [ 2315] 0 2315 17585 8232 25 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+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1756: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 [ 2317] 0 2317 17618 8235 26 3 0 0 syz-executor0 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-executor4/18824: #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 ============================================= [ 2330] 0 2330 17651 8234 25 3 0 0 syz-executor1 [ 2489] 0 2489 17585 8407 24 4 0 0 syz-executor2 [ 2750] 0 2750 17618 8407 25 4 0 1000 syz-executor3 [ 2779] 0 2779 17585 8222 23 3 0 0 syz-executor4 [ 2788] 0 2788 17585 8231 24 3 0 0 syz-executor4 [ 2883] 0 2883 17585 8407 24 4 0 0 syz-executor2 [ 2918] 0 2918 17582 8232 25 3 0 0 syz-executor4 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 [ 2925] 0 2925 17615 8235 25 3 0 0 syz-executor4 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 [ 2939] 0 2939 17618 8234 25 3 0 0 syz-executor0 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 [ 2944] 0 2944 17618 8236 25 3 0 0 syz-executor0 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 32 Comm: kswapd0 Not tainted 4.14.90+ #29 task: ffff8881da31af00 task.stack: ffff8881d9db0000 RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x60 kernel/kcov.c:68 RSP: 0000:ffff8881d9db77a8 EFLAGS: 00000046 RAX: ffff8881da31af00 RBX: 0000000000000001 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffffffa774e400 RDI: ffffffffa774e440 RBP: ffffffffa774e440 R08: 0000000000002c75 R09: 0000000000000000 R10: ffff8881da31b758 R11: 0000000000000001 R12: ffffffffa774e400 R13: ffffffffa7cc0000 R14: ffff8881d9db78b8 R15: ffff8881c6ca7b58 FS: 0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ebdbf1650 CR3: 0000000050826002 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: check_preemption_disabled+0x2f/0x1e0 lib/smp_processor_id.c:16 perf_trace_lock+0x11a/0x4c0 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4dc/0x720 kernel/locking/lockdep.c:4009 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x17/0x40 kernel/locking/spinlock.c:184 spin_unlock include/linux/spinlock.h:357 [inline] __list_lru_count_one mm/list_lru.c:174 [inline] list_lru_count_one+0x12d/0x1d0 mm/list_lru.c:182 list_lru_shrink_count include/linux/list_lru.h:117 [inline] super_cache_count+0x18a/0x2a0 fs/super.c:144 do_shrink_slab mm/vmscan.c:328 [inline] shrink_slab.part.8+0x25c/0xa30 mm/vmscan.c:504 shrink_slab mm/vmscan.c:468 [inline] shrink_node+0x8c8/0xbf0 mm/vmscan.c:2665 kswapd_shrink_node mm/vmscan.c:3296 [inline] balance_pgdat mm/vmscan.c:3402 [inline] kswapd+0x947/0x14b0 mm/vmscan.c:3621 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Code: 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 de 01 00 48 85 c0 74 1a 65 8b 15 3b f5 50 5a 81 e2 00 01 1f 00 75 0b 8b 90 a8 11 00 00 <83> fa 01 74 01 c3 48 c7 c2 00 00 00 81 48 81 ea 00 00 80 a5 48