INFO: task syz.2.205:5065 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.205       state:D stack:23696 pid:5065  ppid:4281   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 mddev_suspend+0x25a/0x570 drivers/md/md.c:471
 location_store+0x695/0x7f0 drivers/md/md-bitmap.c:2337
 md_attr_store+0x183/0x220 drivers/md/md.c:5633
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2271 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8dc939e159
RSP: 002b:00007f8dca31c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8dc9625fa0 RCX: 00007f8dc939e159
RDX: 0000000000000003 RSI: 0000200000000540 RDI: 0000000000000009
RBP: 00007f8dc943506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8dc9626038 R14: 00007f8dc9625fa0 R15: 00007ffdc89f66a8
 </TASK>
INFO: task syz.2.205:5066 blocked for more than 149 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.205       state:D stack:26880 pid:5066  ppid:4281   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 md_write_start+0x72b/0xa50 drivers/md/md.c:8683
 raid1_make_request+0x1c6/0x2da0 drivers/md/raid1.c:1606
 md_handle_request+0x6de/0x970 drivers/md/md.c:415
 __submit_bio+0x217/0x290 block/blk-core.c:593
 __submit_bio_noacct block/blk-core.c:636 [inline]
 submit_bio_noacct_nocheck+0x483/0xaa0 block/blk-core.c:699
 blk_next_bio+0x110/0x150 block/bio.c:350
 __blkdev_issue_zero_pages+0x1bd/0x310 block/blk-lib.c:180
 blkdev_issue_zeroout+0x238/0x470 block/blk-lib.c:272
 blk_ioctl_zeroout block/ioctl.c:197 [inline]
 blkdev_common_ioctl+0x1c58/0x2090 block/ioctl.c:497
 blkdev_ioctl+0x2d8/0x740 block/ioctl.c:620
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8dc939e159
RSP: 002b:00007f8dca2fb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8dc9626090 RCX: 00007f8dc939e159
RDX: 0000200000000600 RSI: 000000000000127f RDI: 0000000000000008
RBP: 00007f8dc943506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8dc9626128 R14: 00007f8dc9626090 R15: 00007ffdc89f66a8
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8cb2e170 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8cb2e990 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
3 locks held by ksoftirqd/1/21:
 #0: ffff8880b8f3acd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:538
 #1: ffff8880b8f27888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x400/0x740 kernel/sched/psi.c:999
 #2: ffff88802dc0e418 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0x5a/0x10b0 kernel/sched/core.c:4112
1 lock held by khungtaskd/27:
 #0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6529
2 locks held by getty/4027:
 #0: ffff88814d9ac098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198
3 locks held by kworker/1:4/4325:
 #0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004947d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8cb334b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #2: ffffffff8cb334b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
2 locks held by kworker/1:5/4326:
 #0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004937d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:13/4536:
5 locks held by syz.2.205/5065:
 #0: ffff888079e759e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ae/0x360 fs/file.c:1038
 #1: ffff8880184d8460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x270/0x9a0 fs/read_write.c:580
 #2: ffff888058844888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1d8/0x520 fs/kernfs/file.c:343
 #3: ffff888020700748 (kn->active#66){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #3: ffff888020700748 (kn->active#66){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x520 fs/kernfs/file.c:344
 #4: ffff8880746a82d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: mddev_lock drivers/md/md.h:577 [inline]
 #4: ffff8880746a82d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: location_store+0x86/0x7f0 drivers/md/md-bitmap.c:2275
2 locks held by syz.2.205/5066:
 #0: ffff888148df3328 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline]
 #0: ffff888148df3328 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:191 [inline]
 #0: ffff888148df3328 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_common_ioctl+0x192d/0x2090 block/ioctl.c:497
 #1: ffff888148df34c8 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:809 [inline]
 #1: ffff888148df34c8 (mapping.invalidate_lock){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:192 [inline]
 #1: ffff888148df34c8 (mapping.invalidate_lock){++++}-{3:3}, at: blkdev_common_ioctl+0x1967/0x2090 block/ioctl.c:497
1 lock held by rm/6612:

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf0e/0xf50 kernel/hung_task.c:377
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6612 Comm: rm Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:189 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:241 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x32/0x80 kernel/kcov.c:316
Code: 74 38 80 7e 65 8b 15 75 38 80 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 1c 16 00 00 00 74 4e 8b 91 f8 15 00 00 <83> fa 03 75 43 48 8b 91 00 16 00 00 44 8b 89 fc 15 00 00 49 c1 e1
RSP: 0018:ffffc9000582f7c8 EFLAGS: 00000246
RAX: ffffffff81bf2d0a RBX: 1ffffd40003aa3e9 RCX: ffff888056939e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000582f910 R08: ffffea0001d51f47 R09: 1ffffd40003aa3e8
R10: dffffc0000000000 R11: fffff940003aa3e9 R12: 00fff58000020056
R13: ffffea0001d51f40 R14: 800000007547d025 R15: ffffea0001d51f48
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f669948ae9c CR3: 0000000056983000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
 arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
 PageCompound include/linux/page-flags.h:297 [inline]
 page_mapcount include/linux/mm.h:884 [inline]
 zap_pte_range mm/memory.c:1452 [inline]
 zap_pmd_range mm/memory.c:1572 [inline]
 zap_pud_range mm/memory.c:1601 [inline]
 zap_p4d_range mm/memory.c:1622 [inline]
 unmap_page_range+0x111a/0x25b0 mm/memory.c:1643
 unmap_vmas+0x260/0x390 mm/memory.c:1728
 exit_mmap+0x20d/0x970 mm/mmap.c:3250
 __mmput+0x118/0x3a0 kernel/fork.c:1210
 exit_mm+0x24d/0x350 kernel/exit.c:572
 do_exit+0x958/0x2570 kernel/exit.c:874
 do_group_exit+0x229/0x2e0 kernel/exit.c:1030
 __do_sys_exit_group kernel/exit.c:1041 [inline]
 __se_sys_exit_group kernel/exit.c:1039 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1039
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f66995e96c5
Code: Unable to access opcode bytes at 0x7f66995e969b.
RSP: 002b:00007ffe35548eb8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f66996eafe8 RCX: 00007f66995e96c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000001 R08: 00007ffe35548e48 R09: 0000000000000000
R10: 00007ffe35548ce0 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f66996e9680 R15: 00007f66996eb000
 </TASK>