device ifb0 entered promiscuous mode INFO: task jbd2/sda1-8:2274 blocked for more than 120 seconds. Not tainted 4.17.0+ #85 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. jbd2/sda1-8 D17432 2274 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2856 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3498 schedule+0xef/0x430 kernel/sched/core.c:3542 io_schedule+0x1c/0x70 kernel/sched/core.c:5165 bit_wait_io+0x18/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xb3/0x130 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0x204/0x3a0 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x76/0x90 fs/buffer.c:118 wait_on_buffer include/linux/buffer_head.h:356 [inline] journal_wait_on_commit_record fs/jbd2/commit.c:174 [inline] jbd2_journal_commit_transaction+0x655b/0x8c18 fs/jbd2/commit.c:865 kjournald2+0x26c/0xb30 fs/jbd2/journal.c:229 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Showing all locks held in the system: 4 locks held by kworker/u4:0/7: #0: 0000000058f3729a ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 0000000058f3729a ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000058f3729a ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000058f3729a ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000058f3729a ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000058f3729a ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000058f3729a ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116 #1: 000000008293b65b (net_cleanup_work){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120 #2: 00000000bacd550a (pernet_ops_rwsem){++++}, at: cleanup_net+0x11a/0xb20 net/core/net_namespace.c:490 #3: 000000009e8b8f7d (rcu_sched_state.barrier_mutex){+.+.}, at: _rcu_barrier+0x142/0x770 kernel/rcu/tree.c:3385 2 locks held by khungtaskd/894: #0: 00000000cfcb9856 (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 00000000cfcb9856 (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 00000000cfcb9856 (rcu_read_lock){....}, at: debug_show_all_locks+0xc8/0x40c kernel/locking/lockdep.c:4461 2 locks held by rs:main Q:Reg/4399: #0: 00000000fe221072 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 #1: 00000000dd037f72 (sb_writers#4){.+.+}, at: file_start_write include/linux/fs.h:2720 [inline] #1: 00000000dd037f72 (sb_writers#4){.+.+}, at: vfs_write+0x452/0x560 fs/read_write.c:548 1 lock held by rsyslogd/4401: 2 locks held by getty/4491: #0: 00000000a26ee9d0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000caaf6182 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4492: #0: 000000006bbd81ef (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000032c80a7e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4493: #0: 00000000c1496e92 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000001fbbf4c9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4494: #0: 00000000c18d11b3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000036551200 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4495: #0: 00000000d6ad2a13 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000d5666a86 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4496: #0: 00000000062b45e5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000004af414a5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4497: #0: 00000000b5d15f49 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000300d3313 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 3 locks held by syz-executor6/20538: #0: 00000000dd037f72 (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] #0: 00000000dd037f72 (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000daa23cdc (&type->i_mutex_dir_key/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] #1: 00000000daa23cdc (&type->i_mutex_dir_key/1){+.+.}, at: do_unlinkat+0x3c4/0xa10 fs/namei.c:4030 #2: 000000005600880b (&sb->s_type->i_mutex_key#10){++++}, at: inode_lock include/linux/fs.h:713 [inline] #2: 000000005600880b (&sb->s_type->i_mutex_key#10){++++}, at: vfs_unlink+0xd1/0x510 fs/namei.c:3972 1 lock held by syz-executor4/22416: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 894 Comm: khungtaskd Not tainted 4.17.0+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22416 Comm: syz-executor4 Not tainted 4.17.0+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bytes_is_nonzero mm/kasan/kasan.c:167 [inline] RIP: 0010:memory_is_nonzero mm/kasan/kasan.c:184 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:210 [inline] RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline] RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline] RIP: 0010:check_memory_region+0x117/0x1b0 mm/kasan/kasan.c:267 Code: 00 4d 85 c0 75 3e 4d 89 e0 49 29 c0 e9 6c ff ff ff 4d 85 c0 74 ba 48 b8 01 00 00 00 00 fc ff df 4d 01 c8 48 01 d8 41 80 39 00 <74> 08 e9 8c 00 00 00 48 89 d8 4c 39 c0 74 97 80 38 00 48 8d 58 01 RSP: 0018:ffff8801ae037120 EFLAGS: 00000046 RAX: ffffed003b5c46d7 RBX: 1ffff1003b5c46d6 RCX: ffffffff81647325 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8801dae236b0 RBP: ffff8801ae037138 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: ffffed003b5c46d7 R13: ffff8801dae236b0 R14: ffff8801ae0371c0 R15: dffffc0000000000 FS: 00007f5a84cbb700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a84c99db8 CR3: 00000001c2bd1000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:349 [inline] rcu_is_watching+0x85/0x140 kernel/rcu/tree.c:1035 rcu_read_unlock include/linux/rcupdate.h:683 [inline] cgroup_account_cputime include/linux/cgroup.h:722 [inline] update_curr_rt+0x80c/0xd20 kernel/sched/rt.c:969 pick_next_task_rt+0x5b8/0x800 kernel/sched/rt.c:1561 pick_next_task kernel/sched/core.c:3357 [inline] __schedule+0x137a/0x1e30 kernel/sched/core.c:3472 schedule+0xef/0x430 kernel/sched/core.c:3542 tun_ring_recv drivers/net/tun.c:2163 [inline] tun_do_read+0x1e54/0x29f0 drivers/net/tun.c:2190 tun_chr_read_iter+0xe5/0x1e0 drivers/net/tun.c:2222 call_read_iter include/linux/fs.h:1780 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x696/0xa50 fs/read_write.c:418 vfs_read+0x17f/0x3d0 fs/read_write.c:452 ksys_pread64+0x174/0x1a0 fs/read_write.c:626 __do_sys_pread64 fs/read_write.c:636 [inline] __se_sys_pread64 fs/read_write.c:633 [inline] __x64_sys_pread64+0x97/0xf0 fs/read_write.c:633 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5a84cbac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 00007f5a84cbb6d4 RCX: 0000000000455a09 RDX: 00000000000002ae RSI: 0000000020000240 RDI: 0000000000000014 RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000054d R14: 00000000006fcfd8 R15: 0000000000000001