INFO: task syz-executor.0:7530 blocked for more than 143 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:13904 pid: 7530 ppid: 6188 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 blkdev_put+0x23/0x140 fs/block_dev.c:1583 blkdev_close+0x1f/0x30 fs/block_dev.c:1632 __fput+0xa1/0x250 fs/file_table.c:280 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x229/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4176f1 RSP: 002b:00007fffcb20de80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fffcb20df70 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c INFO: task syz-executor.0:7531 blocked for more than 143 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:13664 pid: 7531 ppid: 6188 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 blkdev_put+0x23/0x140 fs/block_dev.c:1583 blkdev_close+0x1f/0x30 fs/block_dev.c:1632 __fput+0xa1/0x250 fs/file_table.c:280 task_work_run+0x68/0xb0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x45c/0xd50 kernel/exit.c:825 do_group_exit+0x42/0xb0 kernel/exit.c:922 get_signal+0x155/0xd60 kernel/signal.c:2770 arch_do_signal_or_restart+0xaa/0x8f0 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+0x1b7/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dd99 RSP: 002b:00007f94faf3cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 0000000000012fc0 RCX: 000000000045dd99 RDX: ffffffffffffffff RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fffcb20de0f R14: 00007f94faf3d9c0 R15: 000000000118bf2c INFO: task systemd-udevd:7533 blocked for more than 143 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:13448 pid: 7533 ppid: 3584 flags:0x00004024 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 io_schedule+0xd/0x40 kernel/sched/core.c:6838 wait_on_page_bit_common+0x398/0x410 mm/filemap.c:1273 wait_on_page_bit mm/filemap.c:1334 [inline] wait_on_page_locked include/linux/pagemap.h:674 [inline] wait_on_page_read mm/filemap.c:3061 [inline] do_read_cache_page+0x275/0x3f0 mm/filemap.c:3104 read_mapping_page include/linux/pagemap.h:500 [inline] read_part_sector+0x40/0x150 block/partitions/core.c:693 adfspart_check_ICS+0x2d/0x3a0 block/partitions/acorn.c:360 check_partition block/partitions/core.c:148 [inline] blk_add_partitions+0x163/0x470 block/partitions/core.c:621 bdev_disk_changed+0x6c/0xf0 fs/block_dev.c:1251 __blkdev_get+0x101/0x290 fs/block_dev.c:1333 blkdev_get_by_dev+0xfa/0x200 fs/block_dev.c:1437 blkdev_open+0x59/0xa0 fs/block_dev.c:1534 do_dentry_open+0x15a/0x3c0 fs/open.c:817 do_open fs/namei.c:3254 [inline] path_openat+0x490/0xac0 fs/namei.c:3371 do_filp_open+0x8e/0x100 fs/namei.c:3398 do_sys_openat2+0x229/0x2e0 fs/open.c:1172 do_sys_open+0x46/0x80 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f88ed2c1840 RSP: 002b:00007ffe50cb4e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000563cce1fb6f0 RCX: 00007f88ed2c1840 RDX: 0000563ccd172fe3 RSI: 00000000000a0800 RDI: 0000563cce200760 RBP: 00007ffe50cb5000 R08: 0000563ccd172670 R09: 0000000000000010 R10: 0000563ccd172d0c R11: 0000000000000246 R12: 00007ffe50cb4f50 R13: 0000563cce1fe730 R14: 0000000000000003 R15: 000000000000000e INFO: task systemd-udevd:7535 blocked for more than 143 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:13448 pid: 7535 ppid: 3584 flags:0x00004024 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 io_schedule+0xd/0x40 kernel/sched/core.c:6838 wait_on_page_bit_common+0x398/0x410 mm/filemap.c:1273 wait_on_page_bit mm/filemap.c:1334 [inline] wait_on_page_locked include/linux/pagemap.h:674 [inline] wait_on_page_read mm/filemap.c:3061 [inline] do_read_cache_page+0x275/0x3f0 mm/filemap.c:3104 read_mapping_page include/linux/pagemap.h:500 [inline] read_part_sector+0x40/0x150 block/partitions/core.c:693 adfspart_check_ICS+0x2d/0x3a0 block/partitions/acorn.c:360 check_partition block/partitions/core.c:148 [inline] blk_add_partitions+0x163/0x470 block/partitions/core.c:621 bdev_disk_changed+0x6c/0xf0 fs/block_dev.c:1251 __blkdev_get+0x101/0x290 fs/block_dev.c:1333 blkdev_get_by_dev+0xfa/0x200 fs/block_dev.c:1437 blkdev_open+0x59/0xa0 fs/block_dev.c:1534 do_dentry_open+0x15a/0x3c0 fs/open.c:817 do_open fs/namei.c:3254 [inline] path_openat+0x490/0xac0 fs/namei.c:3371 do_filp_open+0x8e/0x100 fs/namei.c:3398 do_sys_openat2+0x229/0x2e0 fs/open.c:1172 do_sys_open+0x46/0x80 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f88ed2c1840 RSP: 002b:00007ffe50cb4e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000563cce200760 RCX: 00007f88ed2c1840 RDX: 0000563ccd172fe3 RSI: 00000000000a0800 RDI: 0000563cce1f13c0 RBP: 00007ffe50cb5000 R08: 0000563ccd172670 R09: 0000000000000010 R10: 0000563ccd172d0c R11: 0000000000000246 R12: 00007ffe50cb4f50 R13: 0000563cce1fe730 R14: 0000000000000003 R15: 000000000000000e INFO: task systemd-udevd:7554 blocked for more than 144 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:13376 pid: 7554 ppid: 3584 flags:0x00004024 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 io_schedule+0xd/0x40 kernel/sched/core.c:6838 wait_on_page_bit_common+0x398/0x410 mm/filemap.c:1273 wait_on_page_bit mm/filemap.c:1334 [inline] wait_on_page_locked include/linux/pagemap.h:674 [inline] wait_on_page_read mm/filemap.c:3061 [inline] do_read_cache_page+0x275/0x3f0 mm/filemap.c:3104 read_mapping_page include/linux/pagemap.h:500 [inline] read_part_sector+0x40/0x150 block/partitions/core.c:693 adfspart_check_ICS+0x2d/0x3a0 block/partitions/acorn.c:360 check_partition block/partitions/core.c:148 [inline] blk_add_partitions+0x163/0x470 block/partitions/core.c:621 bdev_disk_changed+0x6c/0xf0 fs/block_dev.c:1251 __blkdev_get+0x101/0x290 fs/block_dev.c:1333 blkdev_get_by_dev+0xfa/0x200 fs/block_dev.c:1437 blkdev_open+0x59/0xa0 fs/block_dev.c:1534 do_dentry_open+0x15a/0x3c0 fs/open.c:817 do_open fs/namei.c:3254 [inline] path_openat+0x490/0xac0 fs/namei.c:3371 do_filp_open+0x8e/0x100 fs/namei.c:3398 do_sys_openat2+0x229/0x2e0 fs/open.c:1172 do_sys_open+0x46/0x80 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f88ed2c1840 RSP: 002b:00007ffe50cb4e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000563cce201cd0 RCX: 00007f88ed2c1840 RDX: 0000563ccd172fe3 RSI: 00000000000a0800 RDI: 0000563cce13f9d0 RBP: 00007ffe50cb5000 R08: 0000563ccd172670 R09: 0000000000000010 R10: 0000563ccd172d0c R11: 0000000000000246 R12: 00007ffe50cb4f50 R13: 0000563cce1fb6f0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.3:7618 blocked for more than 144 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:13880 pid: 7618 ppid: 6191 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 blkdev_put+0x23/0x140 fs/block_dev.c:1583 blkdev_close+0x1f/0x30 fs/block_dev.c:1632 __fput+0xa1/0x250 fs/file_table.c:280 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x229/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4176f1 RSP: 002b:00007fff1de25e00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fff1de25ef0 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c INFO: task syz-executor.3:7619 blocked for more than 144 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:13992 pid: 7619 ppid: 6191 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 blkdev_put+0x23/0x140 fs/block_dev.c:1583 blkdev_close+0x1f/0x30 fs/block_dev.c:1632 __fput+0xa1/0x250 fs/file_table.c:280 task_work_run+0x68/0xb0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x45c/0xd50 kernel/exit.c:825 do_group_exit+0x42/0xb0 kernel/exit.c:922 get_signal+0x155/0xd60 kernel/signal.c:2770 arch_do_signal_or_restart+0xaa/0x8f0 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+0x1b7/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dd99 RSP: 002b:00007f5c8a5d1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 0000000000012fc0 RCX: 000000000045dd99 RDX: ffffffffffffffff RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fff1de25d8f R14: 00007f5c8a5d29c0 R15: 000000000118bf2c INFO: task syz-executor.1:7626 blocked for more than 144 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:13904 pid: 7626 ppid: 6184 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 blkdev_put+0x23/0x140 fs/block_dev.c:1583 blkdev_close+0x1f/0x30 fs/block_dev.c:1632 __fput+0xa1/0x250 fs/file_table.c:280 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x229/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4176f1 RSP: 002b:00007ffe2a4ec700 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffe2a4ec7f0 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c INFO: task syz-executor.1:7627 blocked for more than 145 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:14008 pid: 7627 ppid: 6184 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 blkdev_put+0x23/0x140 fs/block_dev.c:1583 blkdev_close+0x1f/0x30 fs/block_dev.c:1632 __fput+0xa1/0x250 fs/file_table.c:280 task_work_run+0x68/0xb0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x45c/0xd50 kernel/exit.c:825 do_group_exit+0x42/0xb0 kernel/exit.c:922 get_signal+0x155/0xd60 kernel/signal.c:2770 arch_do_signal_or_restart+0xaa/0x8f0 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+0x1b7/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dd99 RSP: 002b:00007fc938803c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 0000000000012fc0 RCX: 000000000045dd99 RDX: ffffffffffffffff RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffe2a4ec68f R14: 00007fc9388049c0 R15: 000000000118bf2c INFO: task syz-executor.5:7630 blocked for more than 145 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:13992 pid: 7630 ppid: 6192 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 blkdev_put+0x23/0x140 fs/block_dev.c:1583 blkdev_close+0x1f/0x30 fs/block_dev.c:1632 __fput+0xa1/0x250 fs/file_table.c:280 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x229/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4176f1 RSP: 002b:00007fff3a26d9d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fff3a26dac0 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1188: #0: ffffffff84a13020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x1a6 kernel/locking/lockdep.c:6255 1 lock held by syz-executor.0/7530: #0: ffff88810339e460 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.0/7531: #0: ffff88810339e460 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by systemd-udevd/7533: #0: ffff88810339e460 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1436 1 lock held by systemd-udevd/7535: #0: ffff8881033ca4a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1436 1 lock held by systemd-udevd/7554: #0: ffff888105003520 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1436 1 lock held by syz-executor.3/7618: #0: ffff888105003520 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.3/7619: #0: ffff888105003520 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.1/7626: #0: ffff8881033ca4a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.1/7627: #0: ffff8881033ca4a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.5/7630: #0: ffff8881033dd0e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.5/7631: #0: ffff8881033dd0e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by systemd-udevd/7633: #0: ffff8881033dd0e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1436 1 lock held by syz-executor.4/7635: #0: ffff8881050170a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.4/7636: #0: ffff8881050170a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by systemd-udevd/7638: #0: ffff8881050170a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1436 1 lock held by syz-executor.2/7640: #0: ffff8881033b24e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by syz-executor.2/7641: #0: ffff8881033b24e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1583 1 lock held by systemd-udevd/7643: #0: ffff8881033b24e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1436 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1188 Comm: khungtaskd Not tainted 5.11.0-rc4-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+0xa3/0xc8 lib/dump_stack.c:120 nmi_cpu_backtrace.cold.8+0x68/0x82 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0xd5/0xf0 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+0x5f1/0x6f0 kernel/hung_task.c:294 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60