INFO: task syz-executor160:5658 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor160 state:D stack:27720 pid:5658  tgid:5658  ppid:5652   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7277
 __schedule_loop kernel/sched/core.c:7354 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7661
 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked+0x1f88/0x25b0 kernel/locking/rtmutex.c:1787
 rt_mutex_slowlock+0xbd/0x180 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251
 inode_lock include/linux/fs.h:1024 [inline]
 blkdev_fallocate+0x263/0x550 block/fops.c:884
 vfs_fallocate+0x663/0x7f0 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0xbf/0x110 fs/open.c:365
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01f0db7d29
RSP: 002b:00007ffc9e957318 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007ffc9e957638 RCX: 00007f01f0db7d29
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 0000000000000000 R08: 000000000000000a R09: 000000000000000a
R10: 0000002000000400 R11: 0000000000000246 R12: 00007ffc9e957628
R13: 0000000000000002 R14: 00007ffc9e957350 R15: 0000000000000000
 </TASK>
INFO: task syz-executor160:5659 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor160 state:D stack:27560 pid:5659  tgid:5659  ppid:5654   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7277
 __schedule_loop kernel/sched/core.c:7354 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7661
 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked+0x1f88/0x25b0 kernel/locking/rtmutex.c:1787
 rt_mutex_slowlock+0xbd/0x180 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251
 inode_lock include/linux/fs.h:1024 [inline]
 blkdev_fallocate+0x263/0x550 block/fops.c:884
 vfs_fallocate+0x663/0x7f0 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0xbf/0x110 fs/open.c:365
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01f0db7d29
RSP: 002b:00007ffc9e957318 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007ffc9e957638 RCX: 00007f01f0db7d29
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 0000000000000000 R08: 000000000000000a R09: 000000000000000a
R10: 0000002000000400 R11: 0000000000000246 R12: 00007ffc9e957628
R13: 0000000000000002 R14: 00007ffc9e957350 R15: 0000000000000000
 </TASK>
INFO: task syz-executor160:5660 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor160 state:D stack:27472 pid:5660  tgid:5660  ppid:5655   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7277
 __schedule_loop kernel/sched/core.c:7354 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7661
 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked+0x1f88/0x25b0 kernel/locking/rtmutex.c:1787
 rt_mutex_slowlock+0xbd/0x180 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251
 inode_lock include/linux/fs.h:1024 [inline]
 blkdev_fallocate+0x263/0x550 block/fops.c:884
 vfs_fallocate+0x663/0x7f0 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0xbf/0x110 fs/open.c:365
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01f0db7d29
RSP: 002b:00007ffc9e957318 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007ffc9e957638 RCX: 00007f01f0db7d29
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 0000000000000000 R08: 000000000000000a R09: 000000000000000a
R10: 0000002000000400 R11: 0000000000000246 R12: 00007ffc9e957628
R13: 0000000000000002 R14: 00007ffc9e957350 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
locks held by rcuc/0/20: 4, last CPU#0:
 #0: ffffffff8e059500 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186
 #1: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186
 #2: ffffffff8e1c3da0 (rcu_callback){....}-{0:0}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
 #2: ffffffff8e1c3da0 (rcu_callback){....}-{0:0}, at: rcu_cpu_kthread+0x217/0x1740 kernel/rcu/tree.c:3000
 #3: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #3: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #3: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495
locks held by khungtaskd/38: 1, last CPU#1:
 #0: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5360: 2, on CPU#0:
 #0: ffff888035d000a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900044d62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor160/5657: 3, last CPU#0:
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:884
 #1: ffff888026ab2598 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:1079 [inline]
 #1: ffff888026ab2598 (mapping.invalidate_lock){++++}-{4:4}, at: blkdev_fallocate+0x294/0x550 block/fops.c:885
 #2: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #2: ffffffff8e1c3c80 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495
locks held by syz-executor160/5658: 1, on CPU#1:
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:884
locks held by syz-executor160/5659: 1, on CPU#1:
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:884
locks held by syz-executor160/5660: 1, on CPU#1:
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:884
locks held by syz-executor160/5667: 1, on CPU#1:
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #0: ffff888026ab23c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:884

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 780 Comm: kworker/0:1H Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: kblockd blk_mq_run_work_fn
RIP: 0010:debug_lockdep_rcu_enabled+0xd/0x40 kernel/rcu/update.c:320
Code: 8d 67 48 0f b9 3a 90 eb bc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d db 8c 5a 04 00 <74> 1d 83 3d ea 9c 5a 04 00 74 14 65 48 8b 0d 28 f5 4d 07 31 c0 83
RSP: 0018:ffffc9000568efd8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc9000568f098 RCX: ffffc9000568f408
RDX: ffffc9000568f001 RSI: dffffc0000000000 RDI: ffffc9000568f090
RBP: 1ffffffff20a1301 R08: ffffc9000568f3f0 R09: 0000000000000000
R10: ffffc9000568f0d8 R11: fffff52000ad1e1d R12: ffffc90005688000
R13: ffffffff8177e1bf R14: ffffc9000568f088 R15: ffffc9000568f400
FS:  0000000000000000(0000) GS:ffff888125bc8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a9840f9168 CR3: 00000000448fc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_read_unlock include/linux/rcupdate.h:878 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0x1b5d/0x2550 arch/x86/kernel/unwind_orc.c:709
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3181 [inline]
 call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
 slab_free_hook mm/slub.c:2712 [inline]
 slab_free mm/slub.c:6508 [inline]
 kmem_cache_free+0x539/0x6d0 mm/slub.c:6635
 mempool_free+0xf5/0x140 mm/mempool.c:717
 __bio_chain_endio block/bio.c:329 [inline]
 bio_endio+0x3f/0xac0 block/bio.c:1910
 blk_update_request+0x57b/0xe50 block/blk-mq.c:1016
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1147
 nullb_complete_cmd drivers/block/null_blk/main.c:1420 [inline]
 null_handle_cmd drivers/block/null_blk/main.c:1472 [inline]
 null_queue_rq+0xc2a/0xe70 drivers/block/null_blk/main.c:1711
 blk_mq_dispatch_rq_list+0x4af/0x1a00 block/blk-mq.c:2117
 __blk_mq_sched_dispatch_requests+0x13b7/0x1590 block/blk-mq-sched.c:313
 blk_mq_sched_dispatch_requests+0xda/0x1a0 block/blk-mq-sched.c:329
 blk_mq_run_work_fn+0x231/0x300 block/blk-mq.c:2532
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.368 msecs