Hello, syzbot found the following issue on: HEAD commit: ad8be4fa6e81 Add linux-next specific files for 20211111 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17026efab00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ba9c83199208e103 dashboard link: https://syzkaller.appspot.com/bug?extid=7ab022485f6761927d68 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7ab022485f6761927d68@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor.2:8342 can't die for more than 143 seconds. task:syz-executor.2 state:D stack:27152 pid: 8342 ppid: 6533 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 __bio_queue_enter+0x3c5/0x6a0 block/blk-core.c:441 bio_queue_enter block/blk.h:91 [inline] blk_mq_sched_bio_merge+0x1f0/0x870 block/blk-mq-sched.c:373 blk_attempt_bio_merge block/blk-mq.c:2504 [inline] blk_attempt_bio_merge block/blk-mq.c:2498 [inline] blk_mq_get_new_requests block/blk-mq.c:2527 [inline] blk_mq_get_request block/blk-mq.c:2572 [inline] blk_mq_submit_bio+0x1601/0x21b0 block/blk-mq.c:2609 __submit_bio block/blk-core.c:851 [inline] __submit_bio_noacct_mq block/blk-core.c:926 [inline] submit_bio_noacct block/blk-core.c:952 [inline] submit_bio_noacct+0x82c/0xa20 block/blk-core.c:941 submit_bio block/blk-core.c:1013 [inline] submit_bio+0x1ea/0x430 block/blk-core.c:971 blk_next_bio block/blk-lib.c:19 [inline] __blkdev_issue_zero_pages+0x243/0x4c0 block/blk-lib.c:319 blkdev_issue_zeroout+0x3d0/0x450 block/blk-lib.c:413 blkdev_fallocate+0x318/0x420 block/fops.c:635 vfs_fallocate+0x48d/0xe10 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xcf/0x140 fs/open.c:336 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: 0033:0x7fc9f6c6cae9 RSP: 002b:00007fc9f41e2188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fc9f6d7ff60 RCX: 00007fc9f6c6cae9 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000007 RBP: 00007fc9f6cc6f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000100007e00 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe39e347cf R14: 00007fc9f41e2300 R15: 0000000000022000 </TASK> INFO: task syz-executor.2:8342 blocked for more than 143 seconds. Not tainted 5.15.0-next-20211111-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27152 pid: 8342 ppid: 6533 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 __bio_queue_enter+0x3c5/0x6a0 block/blk-core.c:441 bio_queue_enter block/blk.h:91 [inline] blk_mq_sched_bio_merge+0x1f0/0x870 block/blk-mq-sched.c:373 blk_attempt_bio_merge block/blk-mq.c:2504 [inline] blk_attempt_bio_merge block/blk-mq.c:2498 [inline] blk_mq_get_new_requests block/blk-mq.c:2527 [inline] blk_mq_get_request block/blk-mq.c:2572 [inline] blk_mq_submit_bio+0x1601/0x21b0 block/blk-mq.c:2609 __submit_bio block/blk-core.c:851 [inline] __submit_bio_noacct_mq block/blk-core.c:926 [inline] submit_bio_noacct block/blk-core.c:952 [inline] submit_bio_noacct+0x82c/0xa20 block/blk-core.c:941 submit_bio block/blk-core.c:1013 [inline] submit_bio+0x1ea/0x430 block/blk-core.c:971 blk_next_bio block/blk-lib.c:19 [inline] __blkdev_issue_zero_pages+0x243/0x4c0 block/blk-lib.c:319 blkdev_issue_zeroout+0x3d0/0x450 block/blk-lib.c:413 blkdev_fallocate+0x318/0x420 block/fops.c:635 vfs_fallocate+0x48d/0xe10 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xcf/0x140 fs/open.c:336 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: 0033:0x7fc9f6c6cae9 RSP: 002b:00007fc9f41e2188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fc9f6d7ff60 RCX: 00007fc9f6c6cae9 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000007 RBP: 00007fc9f6cc6f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000100007e00 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe39e347cf R14: 00007fc9f41e2300 R15: 0000000000022000 </TASK> INFO: task syz-executor.0:8372 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:26728 pid: 8372 ppid: 11411 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 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:597 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: 0033:0x7f4a3e38bae9 RSP: 002b:00007f4a3b901188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4a3e49ef60 RCX: 00007f4a3e38bae9 RDX: 0000000020000000 RSI: 0000000000004c02 RDI: 0000000000000004 RBP: 00007f4a3e3e5f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe882d0bf R14: 00007f4a3b901300 R15: 0000000000022000 </TASK> INFO: task syz-executor.0:8372 blocked for more than 144 seconds. Not tainted 5.15.0-next-20211111-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26728 pid: 8372 ppid: 11411 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 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:597 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: 0033:0x7f4a3e38bae9 RSP: 002b:00007f4a3b901188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4a3e49ef60 RCX: 00007f4a3e38bae9 RDX: 0000000020000000 RSI: 0000000000004c02 RDI: 0000000000000004 RBP: 00007f4a3e3e5f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe882d0bf R14: 00007f4a3b901300 R15: 0000000000022000 </TASK> INFO: task syz-executor.3:8374 can't die for more than 144 seconds. task:syz-executor.3 state:D stack:28824 pid: 8374 ppid: 9434 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6397 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 blkdev_put+0x97/0x9e0 block/bdev.c:914 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 get_signal+0x1bef/0x2220 kernel/signal.c:2602 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/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: 0033:0x7fe0e3187ae9 RSP: 002b:00007fe0e06dc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 00007fe0e329b020 RCX: 00007fe0e3187ae9 RDX: ffffffffffffffff RSI: 0000000000004c07 RDI: 0000000000000003 RBP: 00007fe0e31e1f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc9746e67f R14: 00007fe0e06dc300 R15: 0000000000022000 </TASK> INFO: task syz-executor.3:8374 blocked for more than 144 seconds. Not tainted 5.15.0-next-20211111-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28824 pid: 8374 ppid: 9434 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6397 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 blkdev_put+0x97/0x9e0 block/bdev.c:914 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 get_signal+0x1bef/0x2220 kernel/signal.c:2602 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/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: 0033:0x7fe0e3187ae9 RSP: 002b:00007fe0e06dc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 00007fe0e329b020 RCX: 00007fe0e3187ae9 RDX: ffffffffffffffff RSI: 0000000000004c07 RDI: 0000000000000003 RBP: 00007fe0e31e1f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc9746e67f R14: 00007fe0e06dc300 R15: 0000000000022000 </TASK> INFO: task syz-executor.1:8378 can't die for more than 145 seconds. task:syz-executor.1 state:D stack:28496 pid: 8378 ppid: 6531 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6397 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859 blkdev_open+0x154/0x2e0 block/fops.c:501 do_dentry_open+0x4c8/0x1250 fs/open.c:822 do_open fs/namei.c:3426 [inline] path_openat+0x1cad/0x2750 fs/namei.c:3559 do_filp_open+0x1aa/0x400 fs/namei.c:3586 do_sys_openat2+0x16d/0x4d0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_openat fs/open.c:1244 [inline] __se_sys_openat fs/open.c:1239 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239 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: 0033:0x7f8f19777a04 RSP: 002b:00007f8f16d39cc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f8f19777a04 RDX: 0000000000101200 RSI: 00007f8f16d39d60 RDI: 00000000ffffff9c RBP: 00007f8f16d39d60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000101200 R13: 00007ffc4394f41f R14: 00007f8f16d3a300 R15: 0000000000022000 </TASK> INFO: task syz-executor.1:8378 blocked for more than 145 seconds. Not tainted 5.15.0-next-20211111-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28496 pid: 8378 ppid: 6531 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6397 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859 blkdev_open+0x154/0x2e0 block/fops.c:501 do_dentry_open+0x4c8/0x1250 fs/open.c:822 do_open fs/namei.c:3426 [inline] path_openat+0x1cad/0x2750 fs/namei.c:3559 do_filp_open+0x1aa/0x400 fs/namei.c:3586 do_sys_openat2+0x16d/0x4d0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_openat fs/open.c:1244 [inline] __se_sys_openat fs/open.c:1239 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239 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: 0033:0x7f8f19777a04 RSP: 002b:00007f8f16d39cc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f8f19777a04 RDX: 0000000000101200 RSI: 00007f8f16d39d60 RDI: 00000000ffffff9c RBP: 00007f8f16d39d60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000101200 R13: 00007ffc4394f41f R14: 00007f8f16d3a300 R15: 0000000000022000 </TASK> INFO: task syz-executor.5:8379 can't die for more than 145 seconds. task:syz-executor.5 state:D stack:28496 pid: 8379 ppid: 7064 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6397 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859 blkdev_open+0x154/0x2e0 block/fops.c:501 do_dentry_open+0x4c8/0x1250 fs/open.c:822 do_open fs/namei.c:3426 [inline] path_openat+0x1cad/0x2750 fs/namei.c:3559 do_filp_open+0x1aa/0x400 fs/namei.c:3586 do_sys_openat2+0x16d/0x4d0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_openat fs/open.c:1244 [inline] __se_sys_openat fs/open.c:1239 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239 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: 0033:0x7f64a2f2da04 RSP: 002b:00007f64a04efcc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f64a2f2da04 RDX: 0000000000000000 RSI: 00007f64a04efd60 RDI: 00000000ffffff9c RBP: 00007f64a04efd60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007ffd7b06952f R14: 00007f64a04f0300 R15: 0000000000022000 </TASK> INFO: task syz-executor.5:8379 blocked for more than 145 seconds. Not tainted 5.15.0-next-20211111-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28496 pid: 8379 ppid: 7064 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:4984 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6265 schedule+0xd2/0x260 kernel/sched/core.c:6338 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6397 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859 blkdev_open+0x154/0x2e0 block/fops.c:501 do_dentry_open+0x4c8/0x1250 fs/open.c:822 do_open fs/namei.c:3426 [inline] path_openat+0x1cad/0x2750 fs/namei.c:3559 do_filp_open+0x1aa/0x400 fs/namei.c:3586 do_sys_openat2+0x16d/0x4d0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_openat fs/open.c:1244 [inline] __se_sys_openat fs/open.c:1239 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239 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: 0033:0x7f64a2f2da04 RSP: 002b:00007f64a04efcc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f64a2f2da04 RDX: 0000000000000000 RSI: 00007f64a04efd60 RDI: 00000000ffffff9c RBP: 00007f64a04efd60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007ffd7b06952f R14: 00007f64a04f0300 R15: 0000000000022000 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb83a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 2 locks held by systemd-udevd/2977: #0: ffff88801aac1918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 #1: ffff88801aa55360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_open+0x75/0x120 drivers/block/loop.c:1733 1 lock held by in:imklog/6227: 2 locks held by kworker/u4:8/30048: 1 lock held by syz-executor.2/8342: #0: ffff88814089d008 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:828 [inline] #0: ffff88814089d008 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x1e2/0x420 block/fops.c:625 1 lock held by syz-executor.0/8372: #0: ffff88801aa55360 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_set_status+0x2a/0x930 drivers/block/loop.c:1248 1 lock held by syz-executor.3/8374: #0: ffff88801aac1918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914 1 lock held by syz-executor.1/8378: #0: ffff88801aac1918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 1 lock held by syz-executor.5/8379: #0: ffff88801aac1918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-next-20211111-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __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:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2967 Comm: systemd-journal Not tainted 5.15.0-next-20211111-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:139 [inline] RIP: 0010:lock_acquire kernel/locking/lockdep.c:5640 [inline] RIP: 0010:lock_acquire+0x1dc/0x510 kernel/locking/lockdep.c:5602 Code: 48 83 c4 20 e8 35 07 f3 07 b8 ff ff ff ff 65 0f c1 05 08 96 a5 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 <48> 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df 48 01 c3 RSP: 0018:ffffc9000287fba0 EFLAGS: 00000046 RAX: 0000000000000046 RBX: 1ffff9200050ff76 RCX: ffffffff815c915f RDX: 1ffff1100f5584f4 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ff74a07 R10: fffffbfff1fee940 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff907046c8 R15: 0000000000000000 FS: 00007f07119c58c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f070f0fb000 CR3: 000000007f1f5000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:661 debug_object_activate+0x337/0x3e0 lib/debugobjects.c:707 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:2969 [inline] call_rcu+0x2c/0x740 kernel/rcu/tree.c:3065 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: 0033:0x7f0710f54840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007fffcfc186a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007fffcfc189b0 RCX: 00007f0710f54840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005628e5809fd0 RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 00005628e57fd040 R14: 00007fffcfc18970 R15: 00005628e5809df0 </TASK> ---------------- Code disassembly (best guess): 0: 48 83 c4 20 add $0x20,%rsp 4: e8 35 07 f3 07 callq 0x7f3073e 9: b8 ff ff ff ff mov $0xffffffff,%eax e: 65 0f c1 05 08 96 a5 xadd %eax,%gs:0x7ea59608(%rip) # 0x7ea5961e 15: 7e 16: 83 f8 01 cmp $0x1,%eax 19: 0f 85 b4 02 00 00 jne 0x2d3 1f: 9c pushfq 20: 58 pop %rax 21: f6 c4 02 test $0x2,%ah 24: 0f 85 9f 02 00 00 jne 0x2c9 * 2a: 48 83 7c 24 08 00 cmpq $0x0,0x8(%rsp) <-- trapping instruction 30: 74 01 je 0x33 32: fb sti 33: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3a: fc ff df 3d: 48 01 c3 add %rax,%rbx --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
