INFO: task syz-executor:11489 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:11489 tgid:11489 ppid:1      flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
 bdev_open+0xd5/0xd60 block/bdev.c:926
 blkdev_open+0x3d1/0x560 block/fops.c:627
 do_dentry_open+0x97b/0x1510 fs/open.c:960
 vfs_open+0x86/0x230 fs/open.c:1090
 do_open fs/namei.c:3774 [inline]
 path_openat+0x2b6c/0x34b0 fs/namei.c:3933
 do_filp_open+0x1c6/0x3e0 fs/namei.c:3960
 do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
 do_sys_open fs/open.c:1453 [inline]
 __do_sys_openat fs/open.c:1469 [inline]
 __se_sys_openat fs/open.c:1464 [inline]
 __x64_sys_openat+0x13a/0x170 fs/open.c:1464
 x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe8c138de91
RSP: 002b:00007fffe87e05c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fe8c138de91
RDX: 0000000000000002 RSI: 00007fffe87e06d0 RDI: 00000000ffffff9c
RBP: 00007fffe87e06d0 R08: 000000000000000a R09: 00007fffe87e0387
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000082
R13: 00000000000927c0 R14: 000000000005dc1c R15: 00007fffe87e06d0
 </TASK>
INFO: task udevd:12938 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:0     pid:12938 tgid:12938 ppid:110    flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
 bdev_open+0xd5/0xd60 block/bdev.c:926
 blkdev_open+0x3d1/0x560 block/fops.c:627
 do_dentry_open+0x97b/0x1510 fs/open.c:960
 vfs_open+0x86/0x230 fs/open.c:1090
 do_open fs/namei.c:3774 [inline]
 path_openat+0x2b6c/0x34b0 fs/namei.c:3933
 do_filp_open+0x1c6/0x3e0 fs/namei.c:3960
 do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
 do_sys_open fs/open.c:1453 [inline]
 __do_sys_openat fs/open.c:1469 [inline]
 __se_sys_openat fs/open.c:1464 [inline]
 __x64_sys_openat+0x13a/0x170 fs/open.c:1464
 x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f0d502a7407
RSP: 002b:00007ffdaf1875c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f0d50ab3880 RCX: 00007f0d502a7407
RDX: 00000000000a0800 RSI: 0000563c0459a5d0 RDI: ffffffffffffff9c
RBP: 0000563c043652c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000563c045a7f70
R13: 0000563c045a60f0 R14: 0000000000000000 R15: 0000563c045a7f70
 </TASK>
INFO: task syz.6.4437:13984 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.4437      state:D stack:0     pid:13984 tgid:13983 ppid:10917  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 io_schedule+0x89/0xe0 kernel/sched/core.c:8699
 folio_wait_bit_common+0x6ae/0x910 mm/filemap.c:1354
 folio_put_wait_locked mm/filemap.c:1518 [inline]
 do_read_cache_folio+0x14d/0x4d0 mm/filemap.c:3970
 read_cache_folio+0x54/0x90 mm/filemap.c:4020
 read_mapping_folio include/linux/pagemap.h:1021 [inline]
 read_part_sector+0xcc/0x250 block/partitions/core.c:716
 msdos_partition+0x118/0x3000 block/partitions/msdos.c:592
 check_partition block/partitions/core.c:138 [inline]
 blk_add_partitions block/partitions/core.c:583 [inline]
 bdev_disk_changed+0x81c/0x1610 block/partitions/core.c:687
 loop_reread_partitions+0x64/0x110 drivers/block/loop.c:467
 loop_configure+0xfd8/0x1310 drivers/block/loop.c:1074
 lo_ioctl+0x802/0x1d50 drivers/block/loop.c:-1
 blkdev_ioctl+0x546/0x680 block/ioctl.c:699
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x135/0x1b0 fs/ioctl.c:893
 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7efcdcb8f6c9
RSP: 002b:00007efcdda76038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007efcdcde5fa0 RCX: 00007efcdcb8f6c9
RDX: 0000200000000080 RSI: 0000000000004c0a RDI: 0000000000000003
RBP: 00007efcdcc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efcdcde6038 R14: 00007efcdcde5fa0 R15: 00007ffe754ffb98
 </TASK>
INFO: task syz.6.4437:13985 blocked for more than 124 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.4437      state:D stack:0     pid:13985 tgid:13983 ppid:10917  flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 io_schedule+0x89/0xe0 kernel/sched/core.c:8699
 folio_wait_bit_common+0x6ae/0x910 mm/filemap.c:1354
 __folio_lock mm/filemap.c:1731 [inline]
 folio_lock include/linux/pagemap.h:1158 [inline]
 __filemap_get_folio+0x17c/0xaa0 mm/filemap.c:1987
 iomap_get_folio fs/iomap/buffered-io.c:608 [inline]
 __iomap_get_folio fs/iomap/buffered-io.c:754 [inline]
 iomap_write_begin+0x447/0x1810 fs/iomap/buffered-io.c:797
 iomap_write_iter fs/iomap/buffered-io.c:955 [inline]
 iomap_file_buffered_write+0x394/0xc10 fs/iomap/buffered-io.c:1039
 blkdev_buffered_write block/fops.c:665 [inline]
 blkdev_write_iter+0x592/0x790 block/fops.c:730
 aio_write+0x4a1/0x6a0 fs/aio.c:1633
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0xc12/0x18c0 fs/aio.c:2052
 __do_sys_io_submit fs/aio.c:2111 [inline]
 __se_sys_io_submit+0x164/0x3c0 fs/aio.c:2081
 __x64_sys_io_submit+0x7f/0xa0 fs/aio.c:2081
 x64_sys_call+0x1c95/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:210
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7efcdcb8f6c9
RSP: 002b:00007efcdda55038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007efcdcde6090 RCX: 00007efcdcb8f6c9
RDX: 0000200000001640 RSI: 0000000000000016 RDI: 00007efcdda34000
RBP: 00007efcdcc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efcdcde6128 R14: 00007efcdcde6090 R15: 00007ffe754ffb98
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:423
 kthread+0x2ca/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x33/0x70 kernel/kcov.c:217
Code: 8b 45 08 65 48 8b 0c 25 00 eb 04 00 65 8b 15 3c ec 7e 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 ec 0b 00 00 00 <74> 2c 8b 91 c8 0b 00 00 83 fa 02 75 21 48 8b 91 d0 0b 00 00 48 8b
RSP: 0018:ffffc90000230db8 EFLAGS: 00000046
RAX: ffffffff81764896 RBX: ffff8881f6f28380 RCX: ffff888103668000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000230db8 R08: ffff888103668000 R09: 0000000000000002
R10: 0000000000000003 R11: 0000000000000100 R12: ffff8881f6f283bc
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000007841cfe835
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f139225ad58 CR3: 000000010b7b0000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 ktime_get+0x16/0x210 kernel/time/timekeeping.c:741
 clockevents_program_event+0xf0/0x350 kernel/time/clockevents.c:326
 tick_program_event+0x9b/0x120 kernel/time/tick-oneshot.c:44
 __hrtimer_reprogram kernel/time/hrtimer.c:700 [inline]
 hrtimer_reprogram+0x341/0x3e0 kernel/time/hrtimer.c:883
 hrtimer_update_softirq_timer kernel/time/hrtimer.c:1230 [inline]
 hrtimer_run_softirq+0x4af/0x560 kernel/time/hrtimer.c:1837
 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
 __do_softirq kernel/softirq.c:659 [inline]
 invoke_softirq kernel/softirq.c:476 [inline]
 __irq_exit_rcu+0x48/0xc0 kernel/softirq.c:708
 irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
 sysvec_call_function_single+0x7f/0x90 arch/x86/kernel/smp.c:266
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:709
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 ed 97 a7 2c 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 e2 39 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 d3 54 02 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c2
RAX: ffff8881f6f00000 RBX: ffff888103668000 RCX: ffffffff858d70be
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 000000000087c10c
RBP: ffffc900001a7e00 R08: ffff8881f6f39733 R09: 1ffff1103ede72e6
R10: dffffc0000000000 R11: ffffed103ede72e7 R12: 1ffff110206cd000
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff87cb2128
 arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:754
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
 default_idle_call+0x3f/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:185 [inline]
 do_idle+0x1a0/0x470 kernel/sched/idle.c:326
 cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:424
 start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
 common_startup_64+0x13b/0x157
 </TASK>