INFO: task syz-executor.0:4356 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:27408 pid: 4356 ppid: 6596 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x949/0x2710 kernel/sched/core.c:5957 schedule+0xd3/0x290 kernel/sched/core.c:6036 perf_event_free_task+0x519/0x6c0 kernel/events/core.c:12804 copy_process+0x4b59/0x7510 kernel/fork.c:2437 kernel_clone+0xe7/0xac0 kernel/fork.c:2561 __do_sys_clone+0xc8/0x110 kernel/fork.c:2678 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fa044c44188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002124f700 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffea9d96d9f R14: 00007fa044c44300 R15: 0000000000022000 INFO: task syz-executor.0:4356 blocked for more than 143 seconds. Not tainted 5.14.0-rc3-next-20210730-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27408 pid: 4356 ppid: 6596 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x949/0x2710 kernel/sched/core.c:5957 schedule+0xd3/0x290 kernel/sched/core.c:6036 perf_event_free_task+0x519/0x6c0 kernel/events/core.c:12804 copy_process+0x4b59/0x7510 kernel/fork.c:2437 kernel_clone+0xe7/0xac0 kernel/fork.c:2561 __do_sys_clone+0xc8/0x110 kernel/fork.c:2678 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fa044c44188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002124f700 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffea9d96d9f R14: 00007fa044c44300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b97e980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc3-next-20210730-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x28/0x11b lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6278 Comm: rs:main Q:Reg Not tainted 5.14.0-rc3-next-20210730-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ext4_da_should_update_i_disksize fs/ext4/inode.c:3061 [inline] RIP: 0010:ext4_da_write_end+0x6f8/0xb50 fs/ext4/inode.c:3094 Code: 08 00 00 00 4c 89 ff e8 76 aa aa ff 4c 89 fa 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 de 03 00 00 49 8b 1f <31> ff 48 c1 eb 04 83 e3 01 89 de e8 98 25 65 ff 84 db 0f 84 62 fa RSP: 0018:ffffc9000c27fa18 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000113 RCX: ffffffff821098aa RDX: 1ffff1100de4d5b3 RSI: 0000000000000008 RDI: ffff88806f26ad98 RBP: ffff8880703b36a0 R08: 0000000000000000 R09: ffff88806f26ad9f R10: ffffed100de4d5b3 R11: 000000000000003f R12: 00000000000004d8 R13: ffffea0001a44880 R14: ffff8880703b3478 R15: ffff88806f26ad98 FS: 00007f3e58a78700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f52c5dbf000 CR3: 0000000070afa000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: generic_perform_write+0x2c3/0x510 mm/filemap.c:3766 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:269 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2152 [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_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3e5b4bc1cd 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:00007f3e58a77590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f3e4c021a10 RCX: 00007f3e5b4bc1cd RDX: 00000000000004d8 RSI: 00007f3e4c021a10 RDI: 000000000000000a RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f3e4c021790 R13: 00007f3e58a775b0 R14: 0000564bb7d027c0 R15: 00000000000004d8