[17423] 0 17423 17617 8232 24 3 0 0 syz-executor0 [17572] 0 17572 17618 8430 25 4 0 0 syz-executor5 [17575] 0 17575 17585 8407 25 4 0 0 syz-executor0 [17581] 0 17581 17618 8430 25 4 0 0 syz-executor5 INFO: task syz-executor2:3450 blocked for more than 140 seconds. Not tainted 4.14.90+ #29 [17841] 0 17841 17585 8427 25 4 0 0 syz-executor5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [17884] 0 17884 17651 8414 26 4 0 0 syz-executor3 syz-executor2 D27240 3450 1843 0x00000004 [17892] 0 17892 17585 8233 24 3 0 0 syz-executor5 Call Trace: [17895] 0 17895 17618 8414 26 4 0 0 syz-executor0 [17938] 0 17938 17717 8244 24 3 0 0 syz-executor5 schedule+0x7f/0x1b0 kernel/sched/core.c:3490 [18104] 0 18104 17585 8406 26 4 0 0 syz-executor2 [18205] 0 18205 17618 12711 31 3 0 1000 syz-executor4 [18235] 0 18235 17651 8410 25 4 0 0 syz-executor0 [18252] 0 18252 17618 12711 31 3 0 1000 syz-executor4 [18279] 0 18279 17651 8412 25 4 0 0 syz-executor3 __lock_sock+0x11d/0x210 net/core/sock.c:2237 [18282] 0 18282 17651 8412 25 4 0 0 syz-executor3 [18309] 0 18309 17618 12711 31 3 0 1000 syz-executor4 [18362] 0 18362 17618 12711 31 3 0 1000 syz-executor4 [18367] 0 18367 17618 12709 32 3 0 0 syz-executor2 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 [18370] 0 18370 17651 12771 32 3 0 0 syz-executor2 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x8c2/0x2680 net/packet/af_packet.c:3761 [18412] 0 18412 17618 12711 31 3 0 1000 syz-executor4 [18466] 0 18466 17618 12711 31 3 0 1000 syz-executor4 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 [18542] 0 18542 17618 12711 31 3 0 1000 syz-executor4 [18546] 0 18546 17651 8432 25 4 0 0 syz-executor5 [18591] 0 18591 17618 12711 31 3 0 1000 syz-executor4 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 [18660] 0 18660 17618 12711 31 3 0 1000 syz-executor4 RIP: 0033:0x457669 [18731] 0 18731 17618 12711 31 3 0 1000 syz-executor4 RSP: 002b:00007f5720561c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [18788] 0 18788 17618 12711 31 3 0 1000 syz-executor4 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457669 [18820] 0 18820 17651 8433 25 4 0 0 syz-executor5 RDX: 000000000000000e RSI: 0000000000000107 RDI: 0000000000000003 [18850] 0 18850 17618 12711 31 3 0 1000 syz-executor4 [18884] 0 18884 17585 8407 25 4 0 0 syz-executor1 RBP: 000000000072bfa0 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000020000040 R11: 0000000000000246 R12: 00007f57205626d4 R13: 00000000004c4ea4 R14: 00000000004d8f58 R15: 00000000ffffffff Showing all locks held in the system: [18885] 0 18885 17585 8406 26 4 0 0 syz-executor2 2 locks held by init/1: [18911] 0 18911 17618 12711 31 3 0 1000 syz-executor4 #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 [18951] 0 18951 17618 12711 31 3 0 1000 syz-executor4 [18977] 0 18977 17585 8231 25 3 0 0 syz-executor2 [18984] 0 18984 17651 8236 25 3 0 0 syz-executor2 [18997] 0 18997 17618 12711 31 3 0 1000 syz-executor4 [19059] 0 19059 17618 12711 31 3 0 1000 syz-executor4 [19111] 0 19111 17618 12711 31 3 0 1000 syz-executor4 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 rsyslogd/1628: #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/1756: #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 2 locks held by syz-fuzzer/1779: #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 blkid/3460: #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 ============================================= [19171] 0 19171 17618 12711 31 3 0 1000 syz-executor4 [19235] 0 19235 17585 8235 25 3 0 0 syz-executor0 [19241] 0 19241 17585 8235 25 3 0 0 syz-executor0 [19249] 0 19249 17618 12711 31 3 0 1000 syz-executor4 [19265] 0 19265 17651 8411 26 4 0 0 syz-executor2 [19314] 0 19314 17618 12711 31 3 0 1000 syz-executor4 [19366] 0 19366 17618 12711 31 3 0 1000 syz-executor4 [19383] 0 19383 17585 8234 25 3 0 0 syz-executor5 [19388] 0 19388 17618 8236 25 3 0 0 syz-executor5 NMI backtrace for cpu 1 CPU: 1 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 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 [19419] 0 19419 17618 8236 25 3 0 0 syz-executor5 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 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1626 Comm: rs:main Q:Reg Not tainted 4.14.90+ #29 task: ffff8881d570c680 task.stack: ffff8881d4728000 RIP: 0010:preempt_count_sub+0x4e/0x120 kernel/sched/core.c:3185 RSP: 0000:ffff8881d472f470 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000000000004 RDI: ffffffffb7bd8560 RBP: ffff8881d472f478 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8881d570cf28 R11: 0000000000000001 R12: 0000000000000010 R13: ffff8881d472f5c0 R14: ffff8881d472f5c8 R15: 0000000000000000 FS: 00007fdbf5ba0700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043783a CR3: 00000001d5926003 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x29/0x40 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 shrink_zones mm/vmscan.c:2812 [inline] do_try_to_free_pages+0x349/0xde0 mm/vmscan.c:2874 try_to_free_pages+0x204/0x6b0 mm/vmscan.c:3080 __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+0xa8a/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] __page_cache_alloc include/linux/pagemap.h:226 [inline] page_cache_read mm/filemap.c:2286 [inline] filemap_fault+0xcdd/0x14a0 mm/filemap.c:2470 ext4_filemap_fault+0x7d/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+0x991/0x25f0 mm/memory.c:4084 handle_mm_fault+0x2f2/0x6eb mm/memory.c:4121 __do_page_fault+0x45d/0xb60 arch/x86/mm/fault.c:1425 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1104 RIP: f000d740:0x9 RSP: f00145d0:0000000000000009 EFLAGS: 00000069 Code: 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ce 00 00 00 8b 0d 72 68 87 03 85 c9 75 18 65 8b 05 57 c1 cb 4b 25 ff ff ff 7f <39> c3 7f 1b 81 fb fe 00 00 00 76 58 65 8b 05 3f c1 cb 4b f7 db [19421] 0 19421 17651 8238 25 3 0 0 syz-executor5