INFO: task syz-executor.1:16268 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:28112 pid:16268 ppid: 8491 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4361 [inline] __schedule+0x91c/0x23c0 kernel/sched/core.c:5169 schedule+0xcf/0x270 kernel/sched/core.c:5248 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1854 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 __flush_work+0x50e/0xad0 kernel/workqueue.c:3052 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3139 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x29c/0x520 net/9p/trans_fd.c:921 p9_client_create+0x95a/0x1110 net/9p/client.c:1071 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007ff583d27188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 00000000004bfce1 R08: 0000000020000200 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffefe0bd2bf R14: 00007ff583d27300 R15: 0000000000022000 INFO: task syz-executor.1:16268 blocked for more than 143 seconds. Not tainted 5.13.0-rc1-next-20210511-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28112 pid:16268 ppid: 8491 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4361 [inline] __schedule+0x91c/0x23c0 kernel/sched/core.c:5169 schedule+0xcf/0x270 kernel/sched/core.c:5248 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1854 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 __flush_work+0x50e/0xad0 kernel/workqueue.c:3052 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3139 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x29c/0x520 net/9p/trans_fd.c:921 p9_client_create+0x95a/0x1110 net/9p/client.c:1071 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007ff583d27188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 00000000004bfce1 R08: 0000000020000200 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffefe0bd2bf R14: 00007ff583d27300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/1:1/22: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246 #1: ffffc90000dcfda8 ((work_completion)(&m->rq)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250 2 locks held by kworker/u4:2/33: 1 lock held by khungtaskd/1642: #0: ffffffff8bf792a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333 1 lock held by in:imklog/8172: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1642 Comm: khungtaskd Not tainted 5.13.0-rc1-next-20210511-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd3b/0xf50 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8173 Comm: rs:main Q:Reg Not tainted 5.13.0-rc1-next-20210511-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ext4_inode_csum_set+0x2e/0x360 fs/ext4/inode.c:110 Code: 41 55 41 54 49 89 f4 55 53 48 89 fb 4c 8d 7b 28 48 83 ec 08 48 89 14 24 e8 5f fd 67 ff 4c 89 fa 48 b8 00 00 00 00 00 fc ff df <48> c1 ea 03 80 3c 02 00 0f 85 cc 02 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc9000cd8f7f8 EFLAGS: 00000293 RAX: dffffc0000000000 RBX: ffff888034a62b18 RCX: 0000000000000000 RDX: ffff888034a62b40 RSI: ffffffff820cf0f1 RDI: ffff888034a62b18 RBP: ffff888032060800 R08: 000000000000009f R09: 0000000000000020 R10: ffffffff820dd49a R11: 0000000000000000 R12: ffff888032060800 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888034a62b40 FS: 00007fef1351c700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6f160e4000 CR3: 000000002f6f1000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_do_update_inode fs/ext4/inode.c:5132 [inline] ext4_mark_iloc_dirty+0x191c/0x38d0 fs/ext4/inode.c:5724 __ext4_mark_inode_dirty+0x222/0x8d0 fs/ext4/inode.c:5918 ext4_dirty_inode+0xd4/0x110 fs/ext4/inode.c:5947 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2252 generic_update_time+0x21d/0x350 fs/inode.c:1772 update_time fs/inode.c:1785 [inline] file_update_time+0x434/0x520 fs/inode.c:2001 file_modified fs/inode.c:2024 [inline] file_modified+0x7d/0xa0 fs/inode.c:2009 ext4_write_checks fs/ext4/file.c:247 [inline] ext4_buffered_write_iter+0xff/0x4d0 fs/ext4/file.c:264 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fef15f601cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fef1351b590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fef08003bd0 RCX: 00007fef15f601cd RDX: 00000000000003ed RSI: 00007fef08003bd0 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fef08003930 R13: 00007fef1351b5b0 R14: 000055ea275c3360 R15: 00000000000003ed