bisecting fixing commit since fb0155a09b0224a7147cb07a4ce6034c8d29667f building syzkaller on 1b88c6d5c8477f1d4fb3b389443b200acc32e9a8 testing commit fb0155a09b0224a7147cb07a4ce6034c8d29667f with gcc (GCC) 8.1.0 kernel signature: d4eb72b5eab2125693d379506626ef1f391b4be87520d7ac9a0c8bef0e496ea1 run #0: crashed: INFO: task hung in blkdev_put run #1: crashed: INFO: task hung in blkdev_put run #2: crashed: INFO: task hung in blkdev_put run #3: crashed: INFO: task hung in blkdev_put run #4: crashed: INFO: task hung in do_read_cache_page run #5: crashed: INFO: task hung in blkdev_put run #6: crashed: INFO: task hung in blkdev_put run #7: crashed: INFO: task hung in blkdev_put run #8: crashed: INFO: task hung in blkdev_put run #9: crashed: INFO: task hung in blkdev_put testing current HEAD 467f8165a2b0e6accf3d0dd9c8089b1dbde29f7f testing commit 467f8165a2b0e6accf3d0dd9c8089b1dbde29f7f with gcc (GCC) 8.1.0 kernel signature: 578d2bc28777fcefca1e5d71f85151526f257373ea463ebf0d242ec86a6db323 all runs: crashed: INFO: task hung in blkdev_put revisions tested: 2, total time: 24m7.977598193s (build: 9m56.935128573s, test: 13m25.80704596s) the crash still happens on HEAD commit msg: Merge tag 'close-range-cloexec-unshare-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux crash: INFO: task hung in blkdev_put INFO: task syz-executor.0:7608 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:14008 pid: 7608 ppid: 6164 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __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:1582 blkdev_close+0x1f/0x30 fs/block_dev.c:1631 __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:00007ffdf2bb8190 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffdf2bb8280 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c INFO: task syz-executor.0:7609 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:13664 pid: 7609 ppid: 6164 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __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:1582 blkdev_close+0x1f/0x30 fs/block_dev.c:1631 __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+0x42f/0xd20 kernel/exit.c:823 do_group_exit+0x42/0xb0 kernel/exit.c:920 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:00007f4f97b30c78 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: 00007ffdf2bb811f R14: 00007f4f97b319c0 R15: 000000000118bf2c INFO: task systemd-udevd:7612 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:13448 pid: 7612 ppid: 3575 flags:0x00004024 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 io_schedule+0xd/0x40 kernel/sched/core.c:6852 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:692 adfspart_check_ICS+0x2d/0x3a0 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions+0x163/0x470 block/partitions/core.c:620 bdev_disk_changed+0x6c/0xf0 fs/block_dev.c:1250 __blkdev_get+0x101/0x290 fs/block_dev.c:1332 blkdev_get_by_dev+0xfa/0x200 fs/block_dev.c:1436 blkdev_open+0x59/0xa0 fs/block_dev.c:1533 do_dentry_open+0x15a/0x3c0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x490/0xac0 fs/namei.c:3369 do_filp_open+0x8e/0x100 fs/namei.c:3396 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: 0033:0x7f1aa5997840 RSP: 002b:00007fffa3827fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000561edcb84030 RCX: 00007f1aa5997840 RDX: 0000561edb1f8fe3 RSI: 00000000000a0800 RDI: 0000561edcb85550 RBP: 00007fffa3828130 R08: 0000561edb1f8670 R09: 0000000000000010 R10: 0000561edb1f8d0c R11: 0000000000000246 R12: 00007fffa3828080 R13: 0000561edcb7f490 R14: 0000000000000003 R15: 000000000000000e INFO: task systemd-udevd:7614 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:13136 pid: 7614 ppid: 3575 flags:0x00004024 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 io_schedule+0xd/0x40 kernel/sched/core.c:6852 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:692 adfspart_check_ICS+0x2d/0x3a0 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions+0x163/0x470 block/partitions/core.c:620 bdev_disk_changed+0x6c/0xf0 fs/block_dev.c:1250 __blkdev_get+0x101/0x290 fs/block_dev.c:1332 blkdev_get_by_dev+0xfa/0x200 fs/block_dev.c:1436 blkdev_open+0x59/0xa0 fs/block_dev.c:1533 do_dentry_open+0x15a/0x3c0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x490/0xac0 fs/namei.c:3369 do_filp_open+0x8e/0x100 fs/namei.c:3396 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: 0033:0x7f1aa5997840 RSP: 002b:00007fffa38285a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000561edcb828c0 RCX: 00007f1aa5997840 RDX: 0000561edb1f8fe3 RSI: 00000000000a0800 RDI: 0000561edcac39b0 RBP: 00007fffa3828720 R08: 0000561edb1f8670 R09: 0000000000000010 R10: 0000561edb1f8d0c R11: 0000000000000246 R12: 00007fffa3828670 R13: 0000561edcb7f6b0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.1:7615 blocked for more than 144 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:14008 pid: 7615 ppid: 6161 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __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:1582 blkdev_close+0x1f/0x30 fs/block_dev.c:1631 __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:00007fff08f8b5e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fff08f8b6d0 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c INFO: task syz-executor.1:7616 blocked for more than 144 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:14008 pid: 7616 ppid: 6161 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __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:1582 blkdev_close+0x1f/0x30 fs/block_dev.c:1631 __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+0x42f/0xd20 kernel/exit.c:823 do_group_exit+0x42/0xb0 kernel/exit.c:920 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:00007f152ff5fc78 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: 00007fff08f8b56f R14: 00007f152ff609c0 R15: 000000000118bf2c INFO: task systemd-udevd:7620 blocked for more than 144 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:13448 pid: 7620 ppid: 3575 flags:0x00004024 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 io_schedule+0xd/0x40 kernel/sched/core.c:6852 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:692 adfspart_check_ICS+0x2d/0x3a0 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions+0x163/0x470 block/partitions/core.c:620 bdev_disk_changed+0x6c/0xf0 fs/block_dev.c:1250 __blkdev_get+0x101/0x290 fs/block_dev.c:1332 blkdev_get_by_dev+0xfa/0x200 fs/block_dev.c:1436 blkdev_open+0x59/0xa0 fs/block_dev.c:1533 do_dentry_open+0x15a/0x3c0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x490/0xac0 fs/namei.c:3369 do_filp_open+0x8e/0x100 fs/namei.c:3396 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: 0033:0x7f1aa5997840 RSP: 002b:00007fffa3827fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000561edcb854f0 RCX: 00007f1aa5997840 RDX: 0000561edb1f8fe3 RSI: 00000000000a0800 RDI: 0000561edcb7f700 RBP: 00007fffa3828130 R08: 0000561edb1f8670 R09: 0000000000000010 R10: 0000561edb1f8d0c R11: 0000000000000246 R12: 00007fffa3828080 R13: 0000561edcb8b5d0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.2:7622 blocked for more than 144 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:13632 pid: 7622 ppid: 6162 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __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:1582 blkdev_close+0x1f/0x30 fs/block_dev.c:1631 __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:00007fff881a43b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fff881a44a0 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c INFO: task syz-executor.2:7623 blocked for more than 144 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:14008 pid: 7623 ppid: 6162 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __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:1582 blkdev_close+0x1f/0x30 fs/block_dev.c:1631 __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+0x42f/0xd20 kernel/exit.c:823 do_group_exit+0x42/0xb0 kernel/exit.c:920 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:00007f84392cfc78 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: 00007fff881a433f R14: 00007f84392d09c0 R15: 000000000118bf2c INFO: task syz-executor.3:7626 blocked for more than 145 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:13496 pid: 7626 ppid: 6167 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x429/0x9b0 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __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:1582 blkdev_close+0x1f/0x30 fs/block_dev.c:1631 __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:00007ffc016776b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004176f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc016777a0 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: ffffffffffffffff R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1184: #0: ffffffff84a113e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x1a6 kernel/locking/lockdep.c:6255 no locks held by systemd-journal/3569. 1 lock held by in:imklog/5796: #0: ffff888100a85af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x45/0x50 fs/file.c:949 1 lock held by syz-executor.0/7608: #0: ffff888102f7f460 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by syz-executor.0/7609: #0: ffff888102f7f460 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by systemd-udevd/7612: #0: ffff888102fb94a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1435 1 lock held by systemd-udevd/7614: #0: ffff888102f7f460 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1435 1 lock held by syz-executor.1/7615: #0: ffff888102fb94a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by syz-executor.1/7616: #0: ffff888102fb94a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by systemd-udevd/7620: #0: ffff888102f934e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1435 1 lock held by syz-executor.2/7622: #0: ffff888102f934e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by syz-executor.2/7623: #0: ffff888102f934e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by syz-executor.3/7626: #0: ffff888102fa8520 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by syz-executor.3/7627: #0: ffff888102fa8520 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by systemd-udevd/7630: #0: ffff888102fa8520 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1435 1 lock held by syz-executor.5/7631: #0: ffff888104c0f0e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by syz-executor.5/7632: #0: ffff888104c0f0e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by systemd-udevd/7635: #0: ffff888104c0f0e0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1435 1 lock held by syz-executor.4/7636: #0: ffff888102ffa0a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by syz-executor.4/7637: #0: ffff888102ffa0a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x23/0x140 fs/block_dev.c:1582 1 lock held by systemd-udevd/7640: #0: ffff888102ffa0a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x200 fs/block_dev.c:1435 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1184 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c: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 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60