INFO: task syz-executor.1:19211 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc4-syzkaller-00039-gffe78bbd5121 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:27008 pid:19211 ppid:5100   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5307 [inline]
 __schedule+0x173b/0x4630 kernel/sched/core.c:6625
 schedule+0xc3/0x180 kernel/sched/core.c:6701
 io_schedule+0x8c/0x100 kernel/sched/core.c:8887
 folio_wait_bit_common+0x86c/0x12b0 mm/filemap.c:1301
 btrfs_page_mkwrite+0x42d/0xc90 fs/btrfs/inode.c:8153
 do_page_mkwrite+0x1a1/0x600 mm/memory.c:2925
 wp_page_shared mm/memory.c:3274 [inline]
 do_wp_page+0x501/0x3620 mm/memory.c:3356
 handle_pte_fault mm/memory.c:4927 [inline]
 __handle_mm_fault mm/memory.c:5051 [inline]
 handle_mm_fault+0x23a0/0x51c0 mm/memory.c:5197
 do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x5b1/0x7c0 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f3c4fa86c55
RSP: 002b:00007ffebee71c28 EFLAGS: 00010202
RAX: 0000000020000040 RBX: 0000000000000000 RCX: 0000000000737562
RDX: 0000000000000006 RSI: 0000000075622f2e RDI: 0000000020000040
RBP: 00007ffebee71ce8 R08: 00007f3c4fa00000 R09: 00007f3c4f600000
R10: 00007f3c4f605b58 R11: 000000000001d572 R12: 00000000000a1071
R13: 00007ffebee71d10 R14: 00007ffebee71d30 R15: 0000000000000032
 </TASK>
INFO: task syz-executor.1:19214 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc4-syzkaller-00039-gffe78bbd5121 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:23560 pid:19214 ppid:5100   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5307 [inline]
 __schedule+0x173b/0x4630 kernel/sched/core.c:6625
 schedule+0xc3/0x180 kernel/sched/core.c:6701
 wait_on_state fs/btrfs/extent-io-tree.c:707 [inline]
 wait_extent_bit+0x50c/0x670 fs/btrfs/extent-io-tree.c:751
 lock_extent+0x1ce/0x280 fs/btrfs/extent-io-tree.c:1742
 btrfs_page_mkwrite+0x554/0xc90 fs/btrfs/inode.c:8163
 do_page_mkwrite+0x1a1/0x600 mm/memory.c:2925
 wp_page_shared mm/memory.c:3274 [inline]
 do_wp_page+0x501/0x3620 mm/memory.c:3356
 handle_pte_fault mm/memory.c:4927 [inline]
 __handle_mm_fault mm/memory.c:5051 [inline]
 handle_mm_fault+0x23a0/0x51c0 mm/memory.c:5197
 do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x5b1/0x7c0 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:copy_user_short_string+0xd/0x40 arch/x86/lib/copy_user_64.S:233
Code: 74 0a 89 d1 f3 a4 89 c8 0f 01 ca c3 89 d0 0f 01 ca c3 01 ca eb e7 0f 1f 80 00 00 00 00 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a
RSP: 0018:ffffc90015697550 EFLAGS: 00050202
RAX: ffffffff842ff101 RBX: 00007fffffffefc8 RCX: 0000000000000007
RDX: 0000000000000000 RSI: ffffc90015697600 RDI: 00000000200000e0
RBP: ffffc900156976b0 R08: 0000000000000000 R09: fffff52002ad2ec7
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000038
R13: ffffc90015697600 R14: 00000000200000e0 R15: ffffc90015697600
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 _copy_to_user+0xed/0x130 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:169 [inline]
 fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:144
 emit_last_fiemap_cache fs/btrfs/extent_io.c:3036 [inline]
 extent_fiemap+0x1bf9/0x2150 fs/btrfs/extent_io.c:3563
 btrfs_fiemap+0x178/0x1e0 fs/btrfs/inode.c:7835
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x19ba/0x2b10 fs/ioctl.c:810
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3c4fa8c0f9
RSP: 002b:00007f3c50709168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3c4fbabf80 RCX: 00007f3c4fa8c0f9
RDX: 00000000200000c0 RSI: 00000000c020660b RDI: 0000000000000005
RBP: 00007f3c4fae7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffebee71baf R14: 00007f3c50709300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/u4:1/11:
 #0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2363
 #1: ffff8880b9928788 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:976
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8cf255b0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8cf25db0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
 #0: ffffffff8cf253e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/4748:
 #0: ffff8880281ae098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2177
2 locks held by syz-executor.3/5115:
 #0: ffff88807bc340e0 (&type->s_umount_key#65){+.+.}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:361
 #1: ffffffff8cf2a8b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
 #1: ffffffff8cf2a8b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:989
2 locks held by kworker/1:14/5574:
 #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2363
 #1: ffffc9000a107d20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2365
3 locks held by kworker/1:16/5576:
 #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2363
 #1: ffffc9000a127d20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2365
 #2: ffffffff8cf2a8b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
 #2: ffffffff8cf2a8b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x46c/0x890 kernel/rcu/tree_exp.h:989
3 locks held by syz-executor.1/19211:
 #0: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1348 [inline]
 #0: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 #0: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: exc_page_fault+0x18e/0x7c0 arch/x86/mm/fault.c:1554
 #1: ffff8880271ac558 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x1a1/0x600 mm/memory.c:2925
 #2: ffff8880326f2980 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x425/0xc90 fs/btrfs/inode.c:8152
4 locks held by syz-executor.1/19214:
 #0: ffff8880326f2af8 (&sb->s_type->i_mutex_key#22){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline]
 #0: ffff8880326f2af8 (&sb->s_type->i_mutex_key#22){++++}-{3:3}, at: btrfs_inode_lock+0x60/0xd0 fs/btrfs/inode.c:169
 #1: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #1: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1348 [inline]
 #1: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 #1: ffff88802c366d98 (&mm->mmap_lock){++++}-{3:3}, at: exc_page_fault+0x18e/0x7c0 arch/x86/mm/fault.c:1554
 #2: ffff8880271ac558 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x1a1/0x600 mm/memory.c:2925
 #3: ffff8880326f2980 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x425/0xc90 fs/btrfs/inode.c:8152

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc4-syzkaller-00039-gffe78bbd5121 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xec2/0xf00 kernel/hung_task.c:379
 kthread+0x270/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5111 Comm: syz-executor.2 Not tainted 6.3.0-rc4-syzkaller-00039-gffe78bbd5121 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:preempt_count_add+0x44/0x180 kernel/sched/core.c:5778
Code: 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 e2 00 00 00 83 3d bc 75 4f 10 00 75 07 65 8b 05 5b 79 a5 7e 65 01 1d 54 79 a5 7e <48> c7 c0 e0 b0 ad 91 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 d9 00
RSP: 0018:ffffc9000456f270 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffffff91adb003
RDX: dffffc0000000000 RSI: ffffffff81df3667 RDI: 0000000000000001
RBP: 1ffff920008ade6c R08: 0000000000000003 R09: ffffc9000456f450
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801fb2d7c0
R13: ffffc9000456f3a8 R14: dffffc0000000000 R15: dffffc0000000000
FS:  0000555556fd3400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556fdc848 CR3: 0000000042b96000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 unwind_next_frame+0xb7/0x2180 arch/x86/kernel/unwind_orc.c:452
 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x117/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook mm/slub.c:1807 [inline]
 slab_free mm/slub.c:3787 [inline]
 kmem_cache_free+0x297/0x520 mm/slub.c:3809
 free_buffer_head+0x55/0x240 fs/buffer.c:2963
 try_to_free_buffers+0x306/0x610 fs/buffer.c:2904
 block_invalidate_folio+0x681/0xa10 fs/buffer.c:1569
 folio_invalidate mm/truncate.c:159 [inline]
 truncate_cleanup_folio+0x1e3/0x5f0 mm/truncate.c:179
 truncate_inode_pages_range+0x2bc/0x11d0 mm/truncate.c:368
 kill_bdev block/bdev.c:76 [inline]
 blkdev_flush_mapping+0x154/0x2b0 block/bdev.c:584
 blkdev_put_whole block/bdev.c:615 [inline]
 blkdev_put+0x4c4/0x760 block/bdev.c:875
 deactivate_locked_super+0xa4/0x110 fs/super.c:331
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1177
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fafdb28d567
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffea22a30b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fafdb28d567
RDX: 00007ffea22a318b RSI: 000000000000000a RDI: 00007ffea22a3180
RBP: 00007ffea22a3180 R08: 00000000ffffffff R09: 00007ffea22a2f50
R10: 0000555556fd4873 R11: 0000000000000246 R12: 00007fafdb2e6b74
R13: 00007ffea22a4240 R14: 0000555556fd4810 R15: 00007ffea22a4280
 </TASK>