[18408] 0 18408 17585 8197 25 3 0 1000 syz-executor3 [18417] 0 18417 17585 8200 25 3 0 0 syz-executor2 [18436] 0 18436 17652 8205 25 3 0 0 syz-executor2 [18442] 0 18442 17585 8198 25 3 0 1000 syz-executor5 [18459] 0 18459 17618 8235 25 4 0 0 syz-executor2 INFO: task syz-executor4:25353 blocked for more than 140 seconds. Not tainted 4.14.88+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D29544 25353 1849 0x10000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __lock_sock+0x11d/0x210 net/core/sock.c:2237 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x4d8/0x2680 net/packet/af_packet.c:3671 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457659 RSP: 002b:00007fc2d82adc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457659 RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000003 RBP: 000000000072bfa0 R08: 0000000000000010 R09: 0000000000000000 R10: 0000000020000040 R11: 0000000000000246 R12: 00007fc2d82ae6d4 R13: 00000000004c4e83 R14: 00000000004d8f00 R15: 00000000ffffffff Showing all locks held in the system: 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 cron/1684: #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/1760: #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/1785: #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 syz-executor1/18315: #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 kworker/u4:6/6347: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 2 locks held by kworker/u4:8/6350: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 2 locks held by udevd/22843: #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-executor4/25347: #0: (sk_lock-AF_PACKET){+.+.}, at: [] lock_sock include/net/sock.h:1452 [inline] #0: (sk_lock-AF_PACKET){+.+.}, at: [] packet_setsockopt+0x4d8/0x2680 net/packet/af_packet.c:3671 1 lock held by modprobe/25367: #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x14f/0x1d0 mm/util.c:331 2 locks held by kworker/u4:4/25368: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 2 locks held by modprobe/25369: #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 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.88+ #23 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: 1846 Comm: syz-executor2 Not tainted 4.14.88+ #23 task: ffff8881da324680 task.stack: ffff8881a9c30000 RIP: 0010:outb arch/x86/include/asm/io.h:309 [inline] RIP: 0010:io_serial_out+0x68/0x80 drivers/tty/serial/8250/8250_port.c:456 RSP: 0000:ffff8881a9c374c8 EFLAGS: 00000002 RAX: 0000000000000020 RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: 0000000000000000 RDI: ffffffffab727c58 RBP: ffffffffab727c20 R08: 0000000000007824 R09: ffffffffaa908900 R10: ffff8881da324fa0 R11: 0000000000000001 R12: 0000000000000020 R13: ffffffffa816b6b0 R14: dffffc0000000000 R15: ffffffffaadb712a FS: 00000000013a6940(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000013a6c20 CR3: 00000001a995e006 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: uart_console_write+0x4b/0xd0 drivers/tty/serial/serial_core.c:1883 serial8250_console_write+0x51b/0x800 drivers/tty/serial/8250/8250_port.c:3250 call_console_drivers kernel/printk/printk.c:1579 [inline] console_unlock+0x5b9/0xb50 kernel/printk/printk.c:2241 vprintk_emit+0x142/0x180 kernel/printk/printk.c:1777 vprintk_func+0x58/0x159 kernel/printk/printk_safe.c:401 printk+0xa7/0xcf kernel/printk/printk.c:1850 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] __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: 20b664:0x84c RSP: 0000:0000000000001cd8 EFLAGS: 00000000 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 ee 52 7c ff eb c7 e8 17 53 7c ff eb e4 0f 1f