INFO: task systemd-udevd:23068 blocked for more than 143 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:26896 pid:23068 ppid: 2973 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6382 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 lo_release+0x4d/0x1f0 drivers/block/loop.c:1748 blkdev_put_whole block/bdev.c:694 [inline] blkdev_put+0x2fb/0x9e0 block/bdev.c:956 blkdev_close+0x6a/0x80 block/fops.c:515 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff85298a270 RSP: 002b:00007ffc3cf171b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000000000000000f RCX: 00007ff85298a270 RDX: 00007ff852974b58 RSI: 0000000000000000 RDI: 000000000000000f RBP: 00007ff853844710 R08: 00005597a0e14b00 R09: 0000000000000005 R10: 105a7d01ca16b579 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00005597a0e067c0 R15: 000000000000000f INFO: task syz-executor.3:23087 blocked for more than 143 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:24728 pid:23087 ppid: 6772 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 __bio_queue_enter+0x3c5/0x6a0 block/blk-core.c:441 bio_queue_enter block/blk.h:91 [inline] blk_mq_get_request block/blk-mq.c:2588 [inline] blk_mq_submit_bio+0x4ae/0x22c0 block/blk-mq.c:2632 __submit_bio block/blk-core.c:849 [inline] __submit_bio_noacct_mq block/blk-core.c:924 [inline] submit_bio_noacct block/blk-core.c:950 [inline] submit_bio_noacct+0x82c/0xa20 block/blk-core.c:939 submit_bio block/blk-core.c:1011 [inline] submit_bio+0x1ea/0x430 block/blk-core.c:969 submit_bh_wbc+0x5e8/0x7e0 fs/buffer.c:3054 __block_write_full_page+0x875/0x1350 fs/buffer.c:1809 block_write_full_page+0x14d/0x190 fs/buffer.c:2980 __writepage+0x60/0x180 mm/page-writeback.c:2320 write_cache_pages+0x6f4/0x10c0 mm/page-writeback.c:2255 generic_writepages mm/page-writeback.c:2346 [inline] generic_writepages+0xe2/0x150 mm/page-writeback.c:2335 do_writepages+0x1ab/0x690 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:407 [inline] filemap_fdatawrite_wbc+0x143/0x1b0 mm/filemap.c:397 __filemap_fdatawrite_range mm/filemap.c:440 [inline] file_write_and_wait_range+0x163/0x1e0 mm/filemap.c:824 blkdev_fsync+0x4a/0xa0 block/fops.c:465 vfs_fsync_range+0x13a/0x220 fs/sync.c:182 generic_write_sync include/linux/fs.h:2956 [inline] blkdev_write_iter+0x552/0x690 block/fops.c:559 call_write_iter include/linux/fs.h:2162 [inline] do_iter_readv_writev+0x472/0x750 fs/read_write.c:725 do_iter_write+0x188/0x710 fs/read_write.c:851 vfs_iter_write+0x70/0xa0 fs/read_write.c:892 iter_file_splice_write+0x723/0xc70 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:936 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0xaf2/0x1250 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296 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: 0033:0x7f40c1af9ae9 RSP: 002b:00007f40bf06f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f40c1c0cf60 RCX: 00007f40c1af9ae9 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 00007f40c1b53f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000024002da8 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f40c2140b2f R14: 00007f40bf06f300 R15: 0000000000022000 INFO: task syz-executor.3:23090 blocked for more than 144 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27968 pid:23090 ppid: 6772 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178 loop_set_status+0x17d/0x930 drivers/block/loop.c:1264 loop_set_status_old+0x148/0x1b0 drivers/block/loop.c:1396 lo_ioctl+0x3e9/0x17c0 drivers/block/loop.c:1566 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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: 0033:0x7f40c1af9ae9 RSP: 002b:00007f40bf04e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f40c1c0d020 RCX: 00007f40c1af9ae9 RDX: 0000000020000780 RSI: 0000000000004c02 RDI: 0000000000000004 RBP: 00007f40c1b53f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f40c2140b2f R14: 00007f40bf04e300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb83b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by in:imklog/6222: #0: ffff888021d3c0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by systemd-udevd/23068: #0: ffff88801a835918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914 #1: ffff88801a831360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748 1 lock held by syz-executor.3/23090: #0: ffff88801a831360 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_set_status+0x2a/0x930 drivers/block/loop.c:1248 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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:106 nmi_cpu_backtrace.cold+0x47/0x144 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:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 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: 2963 Comm: systemd-journal Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x70/0xc0 kernel/locking/lockdep.c:5116 Code: 06 48 0f af c2 0f b7 53 20 81 e2 ff 1f 00 00 48 39 d0 0f 94 c0 48 83 c4 08 0f b6 c0 5b c3 31 f6 e8 c5 fe ff ff 48 85 c0 75 b2 <31> c0 48 83 c4 08 5b c3 48 83 c4 08 b8 01 00 00 00 5b c3 e8 e8 cf RSP: 0018:ffffc90000007b50 EFLAGS: 00000046 RAX: 0000000000000005 RBX: ffff88807b09e188 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8bb83aa0 RDI: ffff88807b09e188 RBP: ffffffff8bb83aa0 R08: 0000000000000000 R09: ffffffff8d917317 R10: fffffbfff1b22e62 R11: 0000000000000000 R12: ffff88807b09d700 R13: ffff88807b09e160 R14: 00000000ffffffff R15: ffff88807b09e188 FS: 00007fbf6bce98c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbf6928e020 CR3: 000000007afc6000 CR4: 00000000003506f0 Call Trace: __lock_is_held kernel/locking/lockdep.c:5380 [inline] lock_is_held_type+0xa7/0x140 kernel/locking/lockdep.c:5680 lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x442/0x510 kernel/locking/lockdep.c:5608 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 __queue_work+0x366/0xee0 kernel/workqueue.c:1477 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x49f/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:check_kcov_mode+0x2e/0x40 kernel/kcov.c:177 Code: 8d 8a 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 a4 15 00 00 85 d2 74 0b 8b 86 80 15 00 00 39 f8 <0f> 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0 65 8b RSP: 0018:ffffc90001b6fe50 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff88807b2c1680 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88807b09d700 RDI: 0000000000000003 RBP: 0000000000002000 R08: 0000000000000000 R09: 0000000000002000 R10: ffffffff81c96603 R11: 0000000000004000 R12: 0000000000000000 R13: ffffc90001b6fec8 R14: ffff88807b2c1704 R15: 0000000000000001 write_comp_data kernel/kcov.c:221 [inline] __sanitizer_cov_trace_const_cmp8+0x1d/0x70 kernel/kcov.c:294 vfs_read+0x133/0x600 fs/read_write.c:473 ksys_read+0x12d/0x250 fs/read_write.c:619 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: 0033:0x7fbf6b278210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffda131fce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffda1322760 RCX: 00007fbf6b278210 RDX: 0000000000002000 RSI: 00007ffda1320560 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 00007ffda132b080 R10: 00007ffda132b0f0 R11: 0000000000000246 R12: 00007ffda1320560 R13: 00007ffda13226b8 R14: 000055ec77925958 R15: 0005d0c0e19174ed ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 0f af c2 imul %rdx,%rax 4: 0f b7 53 20 movzwl 0x20(%rbx),%edx 8: 81 e2 ff 1f 00 00 and $0x1fff,%edx e: 48 39 d0 cmp %rdx,%rax 11: 0f 94 c0 sete %al 14: 48 83 c4 08 add $0x8,%rsp 18: 0f b6 c0 movzbl %al,%eax 1b: 5b pop %rbx 1c: c3 retq 1d: 31 f6 xor %esi,%esi 1f: e8 c5 fe ff ff callq 0xfffffee9 24: 48 85 c0 test %rax,%rax 27: 75 b2 jne 0xffffffdb * 29: 31 c0 xor %eax,%eax <-- trapping instruction 2b: 48 83 c4 08 add $0x8,%rsp 2f: 5b pop %rbx 30: c3 retq 31: 48 83 c4 08 add $0x8,%rsp 35: b8 01 00 00 00 mov $0x1,%eax 3a: 5b pop %rbx 3b: c3 retq 3c: e8 .byte 0xe8 3d: e8 .byte 0xe8 3e: cf iret