INFO: task syz-executor.1:23629 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:24240 pid:23629 ppid: 16483 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 __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 mpage_bio_submit fs/mpage.c:66 [inline] mpage_readahead+0x589/0x750 fs/mpage.c:393 read_pages+0x1e4/0xfa0 mm/readahead.c:129 page_cache_ra_unbounded+0x64b/0x940 mm/readahead.c:238 do_page_cache_ra mm/readahead.c:268 [inline] ondemand_readahead+0x594/0x1090 mm/readahead.c:551 page_cache_async_ra mm/readahead.c:608 [inline] page_cache_async_ra+0x2e1/0x3f0 mm/readahead.c:583 page_cache_async_readahead include/linux/pagemap.h:1036 [inline] filemap_readahead mm/filemap.c:2531 [inline] filemap_get_pages+0x6f1/0x1be0 mm/filemap.c:2572 filemap_read+0x315/0xeb0 mm/filemap.c:2642 generic_file_read_iter+0x3b6/0x5a0 mm/filemap.c:2792 blkdev_read_iter+0xf8/0x1d0 block/fops.c:583 call_read_iter include/linux/fs.h:2156 [inline] generic_file_splice_read+0x453/0x6d0 fs/splice.c:311 do_splice_to+0x1bf/0x250 fs/splice.c:796 splice_direct_to_actor+0x2c2/0x8c0 fs/splice.c:870 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: 0033:0x7f9c9c5bbae9 RSP: 002b:00007f9c99b31188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f9c9c6cef60 RCX: 00007f9c9c5bbae9 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 00007f9c9c615f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000024002da8 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc7d23d96f R14: 00007f9c99b31300 R15: 0000000000022000 INFO: task syz-executor.1:23659 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27856 pid:23659 ppid: 16483 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178 loop_set_status+0x440/0x930 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: 0033:0x7f9c9c5bbae9 RSP: 002b:00007f9c99b10188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9c9c6cf020 RCX: 00007f9c9c5bbae9 RDX: 0000000020000940 RSI: 0000000000004c02 RDI: 0000000000000004 RBP: 00007f9c9c615f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc7d23d96f R14: 00007f9c99b10300 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 2 locks held by systemd-udevd/2971: #0: ffff88801a164118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 #1: ffff888147540360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_open+0x75/0x120 drivers/block/loop.c:1733 2 locks held by in:imklog/6214: #0: ffff888018e94870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffffffff9071da38 (&obj_hash[i].lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478 3 locks held by kworker/u4:10/11825: #0: ffff8880b9c39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478 #1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x173/0x490 kernel/sched/psi.c:871 #2: ffff8880b9c28298 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:946 1 lock held by syz-executor.1/23629: #0: ffff8881448b0988 (mapping.invalidate_lock#2){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:838 [inline] #0: ffff8881448b0988 (mapping.invalidate_lock#2){.+.+}-{3:3}, at: page_cache_ra_unbounded+0x1b3/0x940 mm/readahead.c:194 1 lock held by syz-executor.1/23659: #0: ffff888147540360 (&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 5.16.0-rc1-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:111 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: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: 6215 Comm: rs:main Q:Reg Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_lockdep_current_cpu_online+0x14/0x150 kernel/rcu/tree.c:1166 Code: 48 8b 44 24 18 e9 41 fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 65 8b 15 69 51 9f 7e 81 e2 00 00 f0 00 b8 01 00 00 00 75 0a <8b> 15 da 06 2e 0c 85 d2 75 01 c3 55 53 65 ff 05 48 51 9f 7e e8 13 RSP: 0018:ffffc9000b7ef7a0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff888144a47bc8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffffff8b5628a0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff81d97e03 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000b7ef958 FS: 00007f9c1bfff700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f47c1778018 CR3: 000000007c96b000 CR4: 0000000000350ef0 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123 trace_block_dirty_buffer include/trace/events/block.h:58 [inline] mark_buffer_dirty+0x2b1/0x650 fs/buffer.c:1086 __ext4_handle_dirty_metadata+0x3c9/0x720 fs/ext4/ext4_jbd2.c:378 ext4_do_update_inode fs/ext4/inode.c:5106 [inline] ext4_mark_iloc_dirty+0x63d/0x1cf0 fs/ext4/inode.c:5694 __ext4_mark_inode_dirty+0x220/0x8d0 fs/ext4/inode.c:5890 ext4_dirty_inode+0xd4/0x110 fs/ext4/inode.c:5919 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2399 generic_update_time+0x21d/0x350 fs/inode.c:1784 inode_update_time fs/inode.c:1797 [inline] file_update_time+0x434/0x520 fs/inode.c:2014 file_modified fs/inode.c:2037 [inline] file_modified+0x7d/0xa0 fs/inode.c:2022 ext4_write_checks fs/ext4/file.c:247 [inline] ext4_buffered_write_iter+0xff/0x3b0 fs/ext4/file.c:264 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:681 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 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: 0033:0x7f9c22aac1cd 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:00007f9c1bffe590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9c10027190 RCX: 00007f9c22aac1cd RDX: 000000000000054b RSI: 00007f9c10027190 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 676e69646e655320 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f9c10026f10 R13: 00007f9c1bffe5b0 R14: 0000562c15c29440 R15: 000000000000054b ---------------- Code disassembly (best guess): 0: 48 8b 44 24 18 mov 0x18(%rsp),%rax 5: e9 41 fe ff ff jmpq 0xfffffe4b a: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 11: 00 00 00 00 15: 90 nop 16: 65 8b 15 69 51 9f 7e mov %gs:0x7e9f5169(%rip),%edx # 0x7e9f5186 1d: 81 e2 00 00 f0 00 and $0xf00000,%edx 23: b8 01 00 00 00 mov $0x1,%eax 28: 75 0a jne 0x34 * 2a: 8b 15 da 06 2e 0c mov 0xc2e06da(%rip),%edx # 0xc2e070a <-- trapping instruction 30: 85 d2 test %edx,%edx 32: 75 01 jne 0x35 34: c3 retq 35: 55 push %rbp 36: 53 push %rbx 37: 65 ff 05 48 51 9f 7e incl %gs:0x7e9f5148(%rip) # 0x7e9f5186 3e: e8 .byte 0xe8 3f: 13 .byte 0x13