INFO: task syz-executor.3:11228 can't die for more than 143 seconds. task:syz-executor.3 state:D stack:25896 pid:11228 ppid: 8525 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4522 schedule+0xcf/0x270 kernel/sched/core.c:4600 schedule_timeout+0x148/0x250 kernel/time/timer.c:1876 gfs2_gl_hash_clear+0x240/0x270 fs/gfs2/glock.c:1989 gfs2_fill_super+0x1e81/0x23f0 fs/gfs2/ops_fstype.c:1233 get_tree_bdev+0x421/0x740 fs/super.c:1344 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1256 vfs_get_tree+0x89/0x2f0 fs/super.c:1549 do_new_mount fs/namespace.c:2896 [inline] path_mount+0x12ae/0x1e70 fs/namespace.c:3227 do_mount fs/namespace.c:3240 [inline] __do_sys_mount fs/namespace.c:3448 [inline] __se_sys_mount fs/namespace.c:3425 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608aa Code: Unable to access opcode bytes at RIP 0x460880. RSP: 002b:00007f6636319a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6636319b20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f6636319ae0 RBP: 00007f6636319ae0 R08: 00007f6636319b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 INFO: task syz-executor.3:11228 blocked for more than 143 seconds. Not tainted 5.9.0-next-20201026-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:25896 pid:11228 ppid: 8525 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4522 schedule+0xcf/0x270 kernel/sched/core.c:4600 schedule_timeout+0x148/0x250 kernel/time/timer.c:1876 gfs2_gl_hash_clear+0x240/0x270 fs/gfs2/glock.c:1989 gfs2_fill_super+0x1e81/0x23f0 fs/gfs2/ops_fstype.c:1233 get_tree_bdev+0x421/0x740 fs/super.c:1344 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1256 vfs_get_tree+0x89/0x2f0 fs/super.c:1549 do_new_mount fs/namespace.c:2896 [inline] path_mount+0x12ae/0x1e70 fs/namespace.c:3227 do_mount fs/namespace.c:3240 [inline] __do_sys_mount fs/namespace.c:3448 [inline] __se_sys_mount fs/namespace.c:3425 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608aa Code: Unable to access opcode bytes at RIP 0x460880. RSP: 002b:00007f6636319a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6636319b20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f6636319ae0 RBP: 00007f6636319ae0 R08: 00007f6636319b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 Showing all locks held in the system: 2 locks held by kworker/u4:0/7: #0: ffff8880b9e34d18 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x789/0xe50 kernel/sched/fair.c:10576 #1: ffffffff8b3373a0 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] #1: ffffffff8b3373a0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x430 kernel/sched/fair.c:6018 1 lock held by khungtaskd/1657: #0: ffffffff8b3373a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 1 lock held by in:imklog/8186: #0: ffff8880119039f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 1 lock held by syz-executor.3/11228: #0: ffff888069dee0e0 (&type->s_umount_key#56/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1657 Comm: khungtaskd Not tainted 5.9.0-next-20201026-syzkaller #0 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+0x107/0x163 lib/dump_stack.c:118 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:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8187 Comm: rs:main Q:Reg Not tainted 5.9.0-next-20201026-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_preemption_disabled+0x2/0x130 lib/smp_processor_id.c:13 Code: 00 00 8b 1d e8 cf 07 04 31 ff 89 de 0f 1f 44 00 00 85 db 75 ae 0f 1f 44 00 00 41 bc 01 00 00 00 e8 f3 c3 cd fa eb 9f cc 41 56 <41> 55 49 89 f5 41 54 55 48 89 fd 53 0f 1f 44 00 00 65 44 8b 25 35 RSP: 0018:ffffc9000ba87778 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 1ffffffff19d9e3b RDX: 0000000000000000 RSI: ffffffff894b5e40 RDI: ffffffff899d6880 RBP: ffffffff8b3372e0 R08: ffff888010726000 R09: ffff88802d359143 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88801e49be18 R14: 00000000ffffffff R15: ffff88801e49be68 FS: 00007fcf7b207700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f93529ec000 CR3: 00000000242d1000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:435 [inline] lock_is_held_type+0xac/0x100 kernel/locking/lockdep.c:5482 lock_is_held include/linux/lockdep.h:271 [inline] ___might_sleep+0x236/0x2b0 kernel/sched/core.c:7263 __ext4_handle_dirty_metadata+0x37/0x730 fs/ext4/ext4_jbd2.c:326 ext4_do_update_inode fs/ext4/inode.c:5132 [inline] ext4_mark_iloc_dirty+0x1990/0x36e0 fs/ext4/inode.c:5709 __ext4_mark_inode_dirty+0x21d/0x8a0 fs/ext4/inode.c:5903 ext4_dirty_inode+0xf3/0x130 fs/ext4/inode.c:5939 __mark_inode_dirty+0x888/0x1190 fs/fs-writeback.c:2260 generic_update_time+0x21c/0x370 fs/inode.c:1764 update_time fs/inode.c:1777 [inline] file_update_time+0x434/0x520 fs/inode.c:1992 file_modified fs/inode.c:2015 [inline] file_modified+0x7d/0xa0 fs/inode.c:2000 ext4_write_checks fs/ext4/file.c:248 [inline] ext4_buffered_write_iter+0xff/0x4d0 fs/ext4/file.c:265 ext4_file_write_iter+0x422/0x1400 fs/ext4/file.c:664 call_write_iter include/linux/fs.h:1887 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x57d/0x700 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fcf7dc4b1cd 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:00007fcf7b206590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fcf70002dc0 RCX: 00007fcf7dc4b1cd RDX: 00000000000003f6 RSI: 00007fcf70002dc0 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fcf70002b20 R13: 00007fcf7b2065b0 R14: 000055ac96f32360 R15: 00000000000003f6