INFO: task syz-executor.0:10073 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27560 pid:10073 ppid: 8416 flags:0x20024004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 io_uring_cancel_files fs/io_uring.c:8699 [inline] io_uring_cancel_task_requests+0x9d9/0xc40 fs/io_uring.c:8730 __io_uring_files_cancel+0x110/0x1b0 fs/io_uring.c:8816 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x299/0x2a60 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 __do_fast_syscall_32+0x62/0x80 arch/x86/entry/common.c:142 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f66549 RSP: 002b:00000000f556067c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: 0000000000000000 RBX: 000000000819afc8 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000819afcc RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1666: #0: ffffffff8bf74220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8110: #0: ffff88801577c0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1666 Comm: khungtaskd Not tainted 5.12.0-rc2-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:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8111 Comm: rs:main Q:Reg Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__kasan_check_write+0x0/0x10 mm/kasan/shadow.c:37 Code: 83 c4 60 5b 5d 41 5c 41 5d c3 c3 e9 c3 1e 0a 07 cc cc cc cc cc cc cc cc cc cc 48 8b 0c 24 89 f6 31 d2 e9 03 f9 ff ff 0f 1f 00 <48> 8b 0c 24 89 f6 ba 01 00 00 00 e9 f0 f8 ff ff 55 53 48 8b 07 48 RSP: 0018:ffffc9000bc1f538 EFLAGS: 00000093 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888022839bc0 RSI: 0000000000000004 RDI: ffff888016987c28 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81d2ff02 R11: 0000000000000000 R12: 0000000000000494 R13: ffff888016987bc8 R14: 0000000000000494 R15: ffff888016987bc8 FS: 00007fd7d9f15700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6b4d5b4000 CR3: 0000000018753000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] get_bh include/linux/buffer_head.h:277 [inline] lookup_bh_lru fs/buffer.c:1307 [inline] __find_get_block+0x211/0xd30 fs/buffer.c:1324 __getblk_gfp+0x28/0x80 fs/buffer.c:1350 sb_getblk include/linux/buffer_head.h:325 [inline] __ext4_get_inode_loc+0x348/0x1130 fs/ext4/inode.c:4332 ext4_get_inode_loc+0xf3/0x1b0 fs/ext4/inode.c:4458 ext4_reserve_inode_write+0xc6/0x230 fs/ext4/inode.c:5743 __ext4_mark_inode_dirty+0x17d/0x8d0 fs/ext4/inode.c:5910 ext4_dirty_inode+0xd4/0x110 fs/ext4/inode.c:5947 __mark_inode_dirty+0x6e3/0x10f0 fs/fs-writeback.c:2274 mark_inode_dirty include/linux/fs.h:2267 [inline] generic_write_end+0x316/0x4f0 fs/buffer.c:2203 ext4_da_write_end+0x20f/0xb50 fs/ext4/inode.c:3112 generic_perform_write+0x2c0/0x4f0 mm/filemap.c:3586 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:269 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:663 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x796/0xa30 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+0x44/0xae RIP: 0033:0x7fd7dc9591cd 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:00007fd7d9f14590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd7d002b930 RCX: 00007fd7dc9591cd RDX: 00000000000004d1 RSI: 00007fd7d002b930 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd7d002b6b0 R13: 00007fd7d9f145b0 R14: 0000558dee3a3440 R15: 00000000000004d1