INFO: task syz-executor.3:3519 blocked for more than 143 seconds.
      Not tainted 5.15.129-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:20696 pid: 3519 ppid:     1 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 inode_lock include/linux/fs.h:787 [inline]
 vfs_unlink+0xe0/0x5f0 fs/namei.c:4198
 do_unlinkat+0x49d/0x940 fs/namei.c:4277
 __do_sys_unlink fs/namei.c:4325 [inline]
 __se_sys_unlink fs/namei.c:4323 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4323
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5d00be1297
RSP: 002b:00007fff8d91ee98 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5d00be1297
RDX: 00007fff8d91eec0 RSI: 00007fff8d91ef50 RDI: 00007fff8d91ef50
RBP: 00007fff8d91ef50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff8d920010
R13: 00007f5d00c2c3b9 R14: 000000000003d455 R15: 0000000000000005
 </TASK>
INFO: task syz-executor.4:18199 blocked for more than 143 seconds.
      Not tainted 5.15.129-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:22608 pid:18199 ppid:  3520 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2662
 try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2710
 ext4_nonda_switch fs/ext4/inode.c:2933 [inline]
 ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2960
 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268
 ext4_file_write_iter+0x87c/0x1990
 __kernel_write+0x5b1/0xa60 fs/read_write.c:539
 __dump_emit+0x264/0x3a0 fs/coredump.c:875
 dump_user_range+0x91/0x320 fs/coredump.c:949
 elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
 do_coredump+0x1852/0x31e0 fs/coredump.c:826
 get_signal+0xc06/0x14e0 kernel/signal.c:2875
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xadbf3f1b
RSP: 002b:0000000020000058 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f0dbd8ddf80 RCX: 00007f0dbd7beae9
RDX: 0000000020000080 RSI: 0000000020000050 RDI: 0000000008204000
RBP: 00007f0dbd80a47a R08: 0000000020000100 R09: 0000000020000100
R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0dbd8ddf80 R15: 00007fffa8242558
 </TASK>
INFO: task syz-executor.4:18248 blocked for more than 145 seconds.
      Not tainted 5.15.129-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:22616 pid:18248 ppid:  3520 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2662
 try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2710
 ext4_nonda_switch fs/ext4/inode.c:2933 [inline]
 ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2960
 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268
 ext4_file_write_iter+0x87c/0x1990
 __kernel_write+0x5b1/0xa60 fs/read_write.c:539
 __dump_emit+0x264/0x3a0 fs/coredump.c:875
 dump_user_range+0x91/0x320 fs/coredump.c:949
 elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
 do_coredump+0x1852/0x31e0 fs/coredump.c:826
 get_signal+0xc06/0x14e0 kernel/signal.c:2875
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xadbf3f1b
RSP: 002b:0000000020000058 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f0dbd8ddf80 RCX: 00007f0dbd7beae9
RDX: 0000000020000080 RSI: 0000000020000050 RDI: 0000000008204000
RBP: 00007f0dbd80a47a R08: 0000000020000100 R09: 0000000020000100
R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0dbd8ddf80 R15: 00007fffa8242558
 </TASK>
INFO: task syz-executor.3:18295 blocked for more than 146 seconds.
      Not tainted 5.15.129-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:22584 pid:18295 ppid:  3519 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2662
 try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2710
 ext4_nonda_switch fs/ext4/inode.c:2933 [inline]
 ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2960
 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268
 ext4_file_write_iter+0x87c/0x1990
 __kernel_write+0x5b1/0xa60 fs/read_write.c:539
 __dump_emit+0x264/0x3a0 fs/coredump.c:875
 dump_user_range+0x91/0x320 fs/coredump.c:949
 elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
 do_coredump+0x1852/0x31e0 fs/coredump.c:826
 get_signal+0xc06/0x14e0 kernel/signal.c:2875
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xadbf3f1b
RSP: 002b:0000000020000058 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f5d00d00f80 RCX: 00007f5d00be1ae9
RDX: 0000000020000080 RSI: 0000000020000050 RDI: 0000000008204000
RBP: 00007f5d00c2d47a R08: 0000000020000100 R09: 0000000020000100
R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f5d00d00f80 R15: 00007fff8d91fc78
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c91f0e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
4 locks held by kworker/u4:4/1101:
 #0: ffff8881423de938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
 #1: ffffc90004ecfd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
 #2: ffff88814b682bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1f6/0x3d10 fs/ext4/inode.c:2677
 #3: ffff88814b684990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x12d5/0x1590 fs/jbd2/transaction.c:466
2 locks held by getty/3264:
 #0: ffff888023be6098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900020a32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
3 locks held by syz-executor.3/3519:
 #0: ffff88814b680460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
 #1: ffff88806f353fc0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #1: ffff88806f353fc0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_unlinkat+0x260/0x940 fs/namei.c:4260
 #2: ffff8880525d35c8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #2: ffff8880525d35c8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_unlink+0xe0/0x5f0 fs/namei.c:4198
2 locks held by syz-executor.2/18151:
2 locks held by syz-executor.4/18162:
1 lock held by syz-executor.1/18176:
1 lock held by syz-executor.2/18189:
3 locks held by syz-executor.4/18199:
 #0: ffff88814b680460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
 #1: ffff88806f3e0de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff88806f3e0de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x360 fs/ext4/file.c:262
 #2: ffff88814b6800e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2707
1 lock held by syz-executor.1/18209:
 #0: ffff88814b682bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1f6/0x3d10 fs/ext4/inode.c:2677
3 locks held by syz-executor.2/18211:
1 lock held by syz-executor.1/18222:
1 lock held by syz-executor.4/18226:
2 locks held by syz-executor.1/18240:
3 locks held by syz-executor.4/18248:
 #0: ffff88814b680460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
 #1: ffff888058a4f198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff888058a4f198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x360 fs/ext4/file.c:262
 #2: ffff88814b6800e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2707
1 lock held by syz-executor.2/18253:
1 lock held by syz-executor.1/18264:
3 locks held by syz-executor.4/18268:
3 locks held by syz-executor.2/18271:
3 locks held by syz-executor.1/18284:
3 locks held by syz-executor.3/18295:
 #0: ffff88814b680460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
 #1: ffff8880525d35c8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff8880525d35c8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x360 fs/ext4/file.c:262
 #2: ffff88814b6800e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2707
2 locks held by syz-executor.2/18299:
3 locks held by syz-executor.4/18313:

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:295
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 18176 Comm: syz-executor.1 Not tainted 5.15.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:check_kcov_mode kernel/kcov.c:165 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2c/0x60 kernel/kcov.c:197
Code: 04 24 65 48 8b 0d 34 54 82 7e 65 8b 15 35 54 82 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 34 16 00 00 00 74 2c <8b> 91 10 16 00 00 83 fa 02 75 21 48 8b 91 18 16 00 00 48 8b 32 48
RSP: 0018:ffffc90007a66ff8 EFLAGS: 00000246
RAX: ffffffff821d26ad RBX: 0000000000000000 RCX: ffff888053df3b80
RDX: 0000000080000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90007a671f0 R08: ffffffff821d268b R09: fffff94000a70539
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea00053829c0
R13: dffffc0000000000 R14: ffffea0005382988 R15: ffffea00053829c8
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005568db6d5600 CR3: 0000000071711000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 _compound_head include/linux/page-flags.h:200 [inline]
 PageDirty include/linux/page-flags.h:348 [inline]
 mpage_prepare_extent_to_map+0x63d/0x1150 fs/ext4/inode.c:2609
 ext4_writepages+0x1273/0x3d10 fs/ext4/inode.c:2815
 do_writepages+0x481/0x730 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc+0x1d6/0x230 mm/filemap.c:400
 __filemap_fdatawrite_range mm/filemap.c:433 [inline]
 __filemap_fdatawrite mm/filemap.c:439 [inline]
 filemap_flush+0x10c/0x150 mm/filemap.c:466
 ext4_release_file+0x7d/0x300 fs/ext4/file.c:141
 __fput+0x3bf/0x890 fs/file_table.c:280
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x6a3/0x2480 kernel/exit.c:872
 do_group_exit+0x144/0x310 kernel/exit.c:994
 get_signal+0xc66/0x14e0 kernel/signal.c:2889
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xadbf3f1b
Code: Unable to access opcode bytes at RIP 0xadbf3ef1.
RSP: 002b:0000000020000058 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fc4b958ff80 RCX: 00007fc4b9470ae9
RDX: 0000000020000080 RSI: 0000000020000050 RDI: 0000000008204000
RBP: 00007fc4b94bc47a R08: 0000000020000100 R09: 0000000020000100
R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007fc4b958ff80 R15: 00007ffc7f53b538
 </TASK>