INFO: task syz.8.24:6241 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.24        state:D stack:27872 pid: 6241 ppid:  6214 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xc46/0x11f0 kernel/locking/rwsem.c:1165
 filemap_invalidate_lock include/linux/fs.h:832 [inline]
 blk_ioctl_zeroout block/ioctl.c:183 [inline]
 blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
 blkdev_ioctl+0x295/0x690 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbba3119d29
RSP: 002b:00007fbba2392038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbba3309fa0 RCX: 00007fbba3119d29
RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003
RBP: 00007fbba3195b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbba3309fa0 R15: 00007ffcda669e08
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c11c320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:2/154:
2 locks held by getty/3945:
 #0: ffff88802b59c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
2 locks held by kworker/0:17/4348:
 #0: ffff888016872138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffffc90002fffd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
1 lock held by syz.7.23/6073:
1 lock held by syz.8.24/6241:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.9.25/6396:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.0.26/6627:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.1.27/7122:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.2.28/7536:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.3.29/8003:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.4.30/8458:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.5.31/8966:
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff888020154438 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
2 locks held by syz-executor/9308:
 #0: ffffffff8d235f08 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d235f08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x974/0xe60 net/core/rtnetlink.c:5647
 #1: ffffffff8c120da8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #1: ffffffff8c120da8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x347/0x6b0 kernel/rcu/tree_exp.h:845

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6073 Comm: syz.7.23 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:get_stack_info+0x2/0xf0 arch/x86/kernel/dumpstack_64.c:193
Code: 89 c0 48 8b 04 c5 a8 67 05 8a c3 83 c7 fb 83 ff 05 77 0b 89 f8 48 8b 04 c5 00 66 05 8a c3 31 c0 c3 0f 1f 80 00 00 00 00 41 57 <41> 56 41 55 41 54 53 48 89 cb 49 89 d6 49 89 f7 48 85 f6 74 07 48
RSP: 0018:ffffc900038fed58 EFLAGS: 00000246
RAX: 1ffff9200071fdc0 RBX: ffffc900038fedc8 RCX: ffffc900038fede8
RDX: ffffc900038fedc8 RSI: ffff888025c1bb80 RDI: ffffc900038fed68
RBP: ffffc900038fee01 R08: dffffc0000000000 R09: ffffc900038fedc8
R10: fffff5200071fdc5 R11: 1ffff9200071fdb9 R12: ffffc900038fed68
R13: ffffc900038fede8 R14: ffffc900038fedf0 R15: 1ffff9200071fdbe
FS:  00007f1dd7ab06c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005594d3fb2350 CR3: 00000000555a2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __unwind_start+0x441/0x740 arch/x86/kernel/unwind_orc.c:673
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x100/0x290 mm/slub.c:3233
 mempool_alloc+0x18f/0x4e0 mm/mempool.c:393
 bio_alloc_bioset+0x124/0x870 block/bio.c:466
 bio_clone_fast+0x21/0x160 block/bio.c:750
 bio_split+0xae/0x2e0 block/bio.c:1505
 blk_bio_segment_split block/blk-merge.c:301 [inline]
 __blk_queue_split+0x1035/0x16a0 block/blk-merge.c:350
 blk_mq_submit_bio+0x1af/0x17b0 block/blk-mq.c:2218
 __submit_bio+0x7bd/0x810 block/blk-core.c:917
 __submit_bio_noacct_mq block/blk-core.c:997 [inline]
 submit_bio_noacct+0x650/0x6d0 block/blk-core.c:1027
 submit_bio+0x2be/0x560 block/blk-core.c:1089
 blk_next_bio block/blk-lib.c:19 [inline]
 __blkdev_issue_zero_pages+0x147/0x3a0 block/blk-lib.c:319
 blkdev_issue_zeroout+0x254/0x4b0 block/blk-lib.c:413
 blk_ioctl_zeroout block/ioctl.c:188 [inline]
 blkdev_common_ioctl+0x19e5/0x1c70 block/ioctl.c:487
 blkdev_ioctl+0x295/0x690 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f1dd8837d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1dd7ab0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1dd8a27fa0 RCX: 00007f1dd8837d29
RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003
RBP: 00007f1dd88b3b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1dd8a27fa0 R15: 00007ffc73a96488
 </TASK>