INFO: task systemd-udevd:22783 blocked for more than 143 seconds. Not tainted 5.13.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:24112 pid:22783 ppid: 4848 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0xb98/0x1120 kernel/sched/core.c:5147 schedule+0x14b/0x200 kernel/sched/core.c:5226 io_schedule+0x83/0x100 kernel/sched/core.c:7215 wait_on_page_bit_common+0x97a/0x1030 mm/filemap.c:1301 wait_on_page_bit mm/filemap.c:1362 [inline] wait_on_page_locked include/linux/pagemap.h:688 [inline] wait_on_page_read+0x19d/0x430 mm/filemap.c:3312 do_read_cache_page+0xb1b/0xe10 mm/filemap.c:3355 read_mapping_page include/linux/pagemap.h:515 [inline] read_part_sector+0x11f/0x310 block/partitions/core.c:672 adfspart_check_ICS+0xa7/0x6d0 block/partitions/acorn.c:360 check_partition block/partitions/core.c:148 [inline] blk_add_partitions+0x420/0x11c0 block/partitions/core.c:609 bdev_disk_changed+0x47e/0x5b0 fs/block_dev.c:1274 __blkdev_get+0x4e6/0xa50 fs/block_dev.c:1358 blkdev_get_by_dev+0xf9/0x640 fs/block_dev.c:1451 blkdev_open+0x132/0x2c0 fs/block_dev.c:1546 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3361 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3494 do_filp_open+0x221/0x460 fs/namei.c:3521 do_sys_openat2+0x124/0x460 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1207 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f19131c3840 RSP: 002b:00007ffdd14e12e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000561373ea6a00 RCX: 00007f19131c3840 RDX: 0000561373b2dfe3 RSI: 00000000000a0800 RDI: 0000561373ea53e0 RBP: 00007ffdd14e1460 R08: 0000561373b2d670 R09: 0000000000000010 R10: 0000561373b2dd0c R11: 0000000000000246 R12: 00007ffdd14e13b0 R13: 0000561373ea5cf0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.4:26069 blocked for more than 143 seconds. Not tainted 5.13.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:26384 pid:26069 ppid: 8446 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0xb98/0x1120 kernel/sched/core.c:5147 schedule+0x14b/0x200 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common+0x118f/0x3100 kernel/locking/mutex.c:1036 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 blkdev_put+0x5c/0x440 fs/block_dev.c:1595 blkdev_close+0x7a/0xa0 fs/block_dev.c:1644 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 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+0x10b/0x200 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 do_syscall_64+0x4b/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4193eb RSP: 002b:00007ffdfa959420 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193eb RDX: 0000001b32e22a4c RSI: ffffffff813a5b0d RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b32e22060 R10: 000000000000135f R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000007488b Showing all locks held in the system: 3 locks held by kworker/u4:1/25: 1 lock held by khungtaskd/1631: #0: ffffffff8cf15c40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8093: #0: ffff888019cdc0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 1 lock held by systemd-udevd/22783: #0: ffff8881455caea0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xee/0x640 fs/block_dev.c:1450 1 lock held by syz-executor.4/26069: #0: ffff8881455caea0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x5c/0x440 fs/block_dev.c:1595 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1631 Comm: khungtaskd Not tainted 5.13.0-rc2-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+0x202/0x31e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xcfb/0xd40 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] RIP: 0010:__lock_acquire+0xe01/0x6040 kernel/locking/lockdep.c:4872 Code: 8a 04 00 84 c0 0f 85 ce 1f 00 00 83 3d 17 22 87 0f 00 48 8b 84 24 c8 00 00 00 75 3c 48 63 d8 48 8d 43 3f 48 85 db 48 0f 49 c3 <48> c1 f8 06 48 8d 3c c5 80 cd 26 90 be 08 00 00 00 e8 99 ce 65 00 RSP: 0018:ffffc90000cc7440 EFLAGS: 00000006 RAX: 00000000000000b1 RBX: 00000000000000b1 RCX: ffffffff90e84703 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9026cd90 RBP: ffffc90000cc77d0 R08: dffffc0000000000 R09: fffffbfff204d9b3 R10: fffffbfff204d9b3 R11: 0000000000000000 R12: ffff888012b3c318 R13: ffffc90000cc7760 R14: ffff888012b3b880 R15: ffff888012b3c338 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0227c64e8 CR3: 000000000cc8e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5512 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159 _extract_crng+0xf8/0x350 drivers/char/random.c:997 extract_crng drivers/char/random.c:1016 [inline] _get_random_bytes+0x1b4/0x230 drivers/char/random.c:1538 eth_random_addr include/linux/etherdevice.h:225 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:521 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x359/0xb20 drivers/net/netdevsim/dev.c:611 process_one_work+0x833/0x10c0 kernel/workqueue.c:2275 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294