[18530] 0 18530 17634 12724 31 3 0 0 syz-executor4 [18553] 0 18553 17667 8425 24 4 0 0 syz-executor5 [18578] 0 18578 17634 8424 25 4 0 1000 syz-executor2 [18610] 0 18610 17634 12724 31 3 0 0 syz-executor4 [18710] 0 18710 17634 8442 25 4 0 1000 syz-executor1 INFO: task syz-executor4:3660 blocked for more than 140 seconds. [18720] 0 18720 17634 12724 31 3 0 0 syz-executor4 Not tainted 4.14.90+ #29 [18815] 0 18815 17634 12724 31 3 0 0 syz-executor4 [18918] 0 18918 17667 8429 25 4 0 1000 syz-executor0 [18975] 0 18975 17634 12724 31 3 0 0 syz-executor4 [19011] 0 19011 17634 8429 26 4 0 1000 syz-executor2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [19030] 0 19030 17634 12724 31 3 0 0 syz-executor4 syz-executor4 D30376 3660 1840 0x00000004 Call Trace: [19047] 0 19047 17601 8423 24 4 0 1000 syz-executor0 [19050] 0 19050 17601 8232 23 3 0 1000 syz-executor0 schedule+0x7f/0x1b0 kernel/sched/core.c:3490 [19084] 0 19084 17634 12724 31 3 0 0 syz-executor4 __lock_sock+0x11d/0x210 net/core/sock.c:2237 [19152] 0 19152 17634 12724 31 3 0 0 syz-executor4 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 [19255] 0 19255 17634 12724 31 3 0 0 syz-executor4 [19316] 0 19316 17634 12724 31 3 0 0 syz-executor4 [19385] 0 19385 17634 12724 31 3 0 0 syz-executor4 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 [19434] 0 19434 17634 12724 31 3 0 0 syz-executor4 [19444] 0 19444 17601 8231 24 3 0 1000 syz-executor3 [19446] 0 19446 17634 8233 24 3 0 1000 syz-executor3 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457759 [19507] 0 19507 17667 8426 25 4 0 1000 syz-executor2 RSP: 002b:00007ff3b668ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [19534] 0 19534 17634 12724 31 3 0 0 syz-executor4 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457759 RDX: 000000000000000c RSI: 0000000000000107 RDI: 0000000000000003 [19620] 0 19620 17634 12724 31 3 0 0 syz-executor4 [19625] 0 19625 17634 8238 25 3 0 1000 syz-executor0 RBP: 000000000073bfa0 R08: 0000000000000004 R09: 0000000000000000 [19628] 0 19628 17667 8255 25 3 0 1000 syz-executor0 R10: 0000000020000180 R11: 0000000000000246 R12: 00007ff3b668b6d4 R13: 00000000004c5448 R14: 00000000004d9c00 R15: 00000000ffffffff [19697] 0 19697 17634 12724 31 3 0 0 syz-executor4 Showing all locks held in the system: [19748] 0 19748 17634 12724 31 3 0 0 syz-executor4 2 locks held by init/1: #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 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/1751: #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/1769: #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 1 lock held by syz-executor3/6315: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x4e/0x110 fs/exec.c:1389 2 locks held by getty/3626: #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 ============================================= [19817] 0 19817 17634 12724 31 3 0 0 syz-executor4 [19877] 0 19877 17601 8230 24 3 0 1000 syz-executor2 [19912] 0 19912 17634 12724 31 3 0 0 syz-executor4 [19931] 0 19931 17667 8235 24 3 0 1000 syz-executor2 [19963] 0 19963 17601 8423 25 4 0 0 syz-executor5 [19988] 0 19988 17634 12724 31 3 0 0 syz-executor4 [20053] 0 20053 17667 8427 26 4 0 0 syz-executor5 [20057] 0 20057 17601 8232 23 3 0 1000 syz-executor0 [20068] 0 20068 17634 12724 31 3 0 0 syz-executor4 [20098] 0 20098 17601 8229 24 3 0 1000 syz-executor1 [20102] 0 20102 17634 8232 25 3 0 1000 syz-executor1 [20157] 0 20157 17634 12724 31 3 0 0 syz-executor4 [20223] 0 20223 17634 12724 31 3 0 0 syz-executor4 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 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: 1623 Comm: rsyslogd Not tainted 4.14.90+ #29 task: ffff8881d086c680 task.stack: ffff8881d0b98000 RIP: 0010:shrink_slab.part.8+0x1e6/0xa30 mm/vmscan.c:501 RSP: 0000:ffff8881d0b9f4f8 EFLAGS: 00000297 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000064 RDI: ffff8881c34b1850 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8881d086cf28 R11: 0000000000000001 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8881c34b1830 R15: dffffc0000000000 FS: 00007efd50881700(0000) GS:ffff8881d7600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000416d30 CR3: 00000001d2b52006 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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: 0009:0x51 RSP: 51eb350c:0000000000000004 EFLAGS: 00000000 Code: 03 42 80 3c 38 00 0f 85 c5 07 00 00 49 8b 5e 20 48 89 d8 48 d1 e8 83 e0 01 40 38 c5 0f 85 dc 02 00 00 e8 1e f8 e9 ff 8b 44 24 18 <83> e3 01 89 44 24 1c 75 18 e8 0c f8 e9 ff c7 84 24 c8 00 00 00 [20255] 0 20255 17634 12724 31 3 0 0 syz-executor4