[29994] 0 29994 6970 4881 20 3 0 -1000 blkid [29996] 0 29996 6690 4617 19 3 0 -1000 blkid [29997] 0 29997 6744 4684 20 3 0 -1000 blkid [29998] 0 29998 6736 4684 19 3 0 -1000 blkid [29999] 0 29999 6604 4553 19 3 0 -1000 blkid INFO: task syz-executor.3:1856 blocked for more than 140 seconds. Not tainted 4.14.131+ #13 [30000] 0 30000 6538 4486 19 3 0 -1000 blkid "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [30001] 0 30001 6958 4882 20 3 0 -1000 blkid syz-executor.3 D24992 1856 1847 0x00000000 [30002] 0 30002 6854 4815 20 3 0 -1000 blkid Call Trace: [30003] 0 30003 6716 4684 20 3 0 -1000 blkid [30004] 0 30004 7136 5081 21 3 0 -1000 blkid [30005] 0 30005 6578 4551 20 3 0 -1000 blkid schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 [30006] 0 30006 6604 4553 18 4 0 -1000 blkid [30007] 0 30007 6332 4287 18 3 0 -1000 blkid [30008] 0 30008 6496 4420 19 3 0 -1000 blkid [30009] 0 30009 6686 4618 19 3 0 -1000 blkid [30010] 0 30010 6232 4157 20 3 0 -1000 blkid [30011] 0 30011 6748 4684 20 3 0 -1000 blkid xt_find_table_lock+0x35/0x3d0 net/netfilter/x_tables.c:1092 [30012] 0 30012 6506 4419 19 3 0 -1000 blkid get_info+0x11b/0x580 net/ipv4/netfilter/arp_tables.c:801 [30013] 0 30013 6686 4618 19 3 0 -1000 blkid [30014] 0 30014 6862 4816 21 3 0 -1000 blkid [30015] 0 30015 6658 4617 19 3 0 -1000 blkid [30016] 0 30016 6370 4288 20 3 0 -1000 blkid [30017] 0 30017 6816 4750 21 3 0 -1000 blkid [30018] 0 30018 7710 5673 22 3 0 -1000 blkid [30019] 0 30019 6878 4816 20 3 0 -1000 blkid [30021] 0 30021 7076 5014 20 3 0 -1000 blkid [30022] 0 30022 6660 4617 19 3 0 -1000 blkid [30023] 0 30023 6686 4618 21 3 0 -1000 blkid [30024] 0 30024 6612 4552 20 3 0 -1000 blkid [30025] 0 30025 6440 4354 19 3 0 -1000 blkid [30026] 0 30026 7278 5212 20 3 0 -1000 blkid [30027] 0 30027 6634 4551 20 3 0 -1000 blkid Showing all locks held in the system: [30028] 0 30028 7414 5343 22 3 0 -1000 blkid 1 lock held by init/1: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<00000000935eb358>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 1 lock held by rsyslogd/1632: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by cron/1675: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1760: #0: (&tty->ldisc_sem){++++}, at: [<000000005bb79eb2>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000008e9f6a7a>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 1 lock held by syz-fuzzer/1783: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by syz-executor.3/1856: #0: (&xt[i].mutex){+.+.}, at: [<0000000036e090eb>] xt_find_table_lock+0x35/0x3d0 net/netfilter/x_tables.c:1092 1 lock held by udevd/2891: #0: (&mm->mmap_sem){++++}, at: [<00000000c7b59cc4>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352 1 lock held by udevd/9528: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 3 locks held by syz-executor.0/14444: #0: (&dup_mmap_sem){.+.+}, at: [<00000000d570c27d>] dup_mmap kernel/fork.c:609 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000d570c27d>] dup_mm kernel/fork.c:1211 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000d570c27d>] copy_mm kernel/fork.c:1266 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000d570c27d>] copy_process.part.0+0x39db/0x65d0 kernel/fork.c:1789 #1: (&mm->mmap_sem){++++}, at: [<000000009fa5031e>] dup_mmap kernel/fork.c:610 [inline] #1: (&mm->mmap_sem){++++}, at: [<000000009fa5031e>] dup_mm kernel/fork.c:1211 [inline] #1: (&mm->mmap_sem){++++}, at: [<000000009fa5031e>] copy_mm kernel/fork.c:1266 [inline] #1: (&mm->mmap_sem){++++}, at: [<000000009fa5031e>] copy_process.part.0+0x39f7/0x65d0 kernel/fork.c:1789 #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000b301adfc>] dup_mmap kernel/fork.c:619 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000b301adfc>] dup_mm kernel/fork.c:1211 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000b301adfc>] copy_mm kernel/fork.c:1266 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000b301adfc>] copy_process.part.0+0x3a3f/0x65d0 kernel/fork.c:1789 1 lock held by udevd/2000: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/7445: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11028: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11053: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11057: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11086: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11099: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11100: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11105: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11118: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11119: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11133: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11145: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11149: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11157: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11171: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by udevd/11183: #0: (&mm->mmap_sem){++++}, at: [<00000000c7b59cc4>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352 #1: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11185: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11196: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by udevd/11198: #0: (&mm->mmap_sem){++++}, at: [<00000000c7b59cc4>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352 #1: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11213: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11214: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11222: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11226: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11240: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11241: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11243: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11261: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11267: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11268: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11269: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11270: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11289: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11290: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11291: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11293: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11337: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by udevd/11361: #0: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by udevd/11511: #0: (&mm->mmap_sem){++++}, at: [<00000000c7b59cc4>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352 #1: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by udevd/11554: #0: (&mm->mmap_sem){++++}, at: [<00000000c7b59cc4>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352 #1: (&ei->i_mmap_sem){++++}, at: [<00000000572ba0ae>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.131+ #13 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11467 Comm: udevd Not tainted 4.14.131+ #13 task: 0000000050b4e075 task.stack: 00000000ed991656 RIP: 0010:debug_lockdep_rcu_enabled.part.0+0x26/0x50 kernel/rcu/update.c:300 RSP: 0000:ffff8881a7246ff0 EFLAGS: 00000807 RAX: dffffc0000000000 RBX: ffff88819f49de00 RCX: 1ffffffff1c827c4 RDX: 0000000000000000 RSI: 1ffffffff1c14e85 RDI: ffff88819f49e62c RBP: ffff8881d6a06a48 R08: 0000000000007c05 R09: 0000000000000000 R10: ffff88819f49e680 R11: 0000000000000001 R12: ffff8881c340dab8 R13: 0000000000000000 R14: 0000000000000297 R15: dffffc0000000000 FS: 00007f454580c7a0(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f45451cf2b8 CR3: 0000000181742002 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x41a/0x730 kernel/locking/lockdep.c:4009 Code: 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 65 48 8b 1c 25 c0 de 01 00 48 8d bb 2c 08 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 0f 8b 93 2c 08