INFO: task syz.2.195:6584 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.195       state:D stack:20840 pid:6584  tgid:6583  ppid:5833   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 vfs_setxattr+0x144/0x2f0
 filename_setxattr+0x274/0x600
 path_setxattrat+0x364/0x3a0
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd8418ec29
RSP: 002b:00007fdd84fa6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fdd843d5fa0 RCX: 00007fdd8418ec29
RDX: 0000200000000340 RSI: 0000200000000140 RDI: 0000200000000100
RBP: 00007fdd84211e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd843d6038 R14: 00007fdd843d5fa0 R15: 00007ffefc529d58
 </TASK>
INFO: task syz.2.195:6593 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.195       state:D stack:17736 pid:6593  tgid:6593  ppid:6584   task_flags:0x440640 flags:0x00004006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 __down_common+0x319/0x6a0
 down+0x80/0xd0
 xfs_buf_lock+0x15d/0x4d0
 xfs_buf_find_lock+0x42/0x4c0
 xfs_buf_get_map+0x1047/0x17e0
 xfs_buf_read_map+0x82/0xa50
 xfs_trans_read_buf_map+0x1d7/0x8e0
 xfs_read_agf+0x281/0x5c0
 xfs_alloc_read_agf+0x17c/0xb70
 xfs_alloc_fix_freelist+0x60a/0x1300
 xfs_alloc_vextent_prepare_ag+0xdb/0x610
 xfs_alloc_vextent_iterate_ags+0x140/0x940
 xfs_alloc_vextent_start_ag+0x388/0x850
 xfs_bmapi_allocate+0x188e/0x2e00
 xfs_bmapi_convert_delalloc+0x7e2/0x1430
 xfs_writeback_range+0x674/0xf70
 iomap_writeback_folio+0xe75/0x1c80
 iomap_writepages+0x162/0x2d0
 xfs_vm_writepages+0x296/0x310
 do_writepages+0x32e/0x550
 file_write_and_wait_range+0x23e/0x340
 xfs_file_fsync+0x195/0x800
 xfs_file_buffered_write+0x723/0x8a0
 __kernel_write_iter+0x428/0x910
 __kernel_write+0xef/0x150
 __dump_emit+0x206/0x310
 writenote+0x1be/0x2e0
 elf_core_dump+0x2e1b/0x3990
 coredump_write+0x1169/0x1900
 vfs_coredump+0x1daa/0x2a50
 get_signal+0x1109/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fdd8404f987
RSP: 002b:00007fdd84f87460 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007fdd8418ec29
RDX: 00007fdd84f87480 RSI: 00007fdd84f875b0 RDI: 000000000000000b
RBP: 00007fdd84211e41 R08: 0000000000000000 R09: 0000000000000058
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd843d6038 R14: 00007fdd843d5fa0 R15: 00007ffefc529d58
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8dd3aca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u10:4/1088:
 #0: ffff88810608b948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90006fa7bc0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by getty/5655:
 #0: ffff8880222c90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
4 locks held by kworker/1:4/5877:
 #0: ffff888104af2548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000449fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8881074ba198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88812f1d3198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
4 locks held by udevd/5982:
 #0: ffff88810ebfd790 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88803bf9a488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff88810ea5e1e8 (kn->active#31){.+.+}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff88812f1d3198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
2 locks held by syz.2.195/6584:
 #0: ffff88802fb5c428 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88803017b7b0 (&sb->s_type->i_mutex_key#23){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0
4 locks held by syz.2.195/6594:
 #0: ffff88802fb5c428 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88803017b7b0 (&sb->s_type->i_mutex_key#23){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0
 #2: ffff88802fb5c618 (sb_internal#3){.+.+}-{0:0}, at: xfs_trans_alloc+0xd7/0x980
 #3: ffff88803017b598 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_trans_alloc_inode+0x161/0x4a0
3 locks held by syz.2.195/6593:
 #0: ffff88802fb5c428 (sb_writers#15){.+.+}-{0:0}, at: vfs_coredump+0x1daa/0x2a50
 #1: ffff88802fb5c618 (sb_internal#3){.+.+}-{0:0}, at: xfs_trans_alloc+0xd7/0x980
 #2: ffff8881239c9798 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_bmapi_convert_delalloc+0x32c/0x1430
2 locks held by syz.4.450/7696:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.4.450/7698:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.4.450/7701:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.4.450/7704:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.4.450/7705:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.4.450/7706:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.4.450/7707:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.4.450/7709:
 #0: ffff88802fb5c0e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88802fb5c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10
2 locks held by syz.9.1000/9935:
1 lock held by modprobe/9948:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_preemption_disabled+0x40/0x120
Code: 08 65 8b 05 66 61 14 07 65 8b 0d 5b 61 14 07 f7 c1 ff ff ff 7f 74 23 65 48 8b 0d 3b 61 14 07 48 3b 4c 24 08 0f 85 cc 00 00 00 <48> 83 c4 10 5b 41 5e 41 5f 5d c3 cc cc cc cc cc 48 c7 04 24 00 00
RSP: 0018:ffffc900000f79c8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 413036a772bbf500
RDX: ffff88801b685640 RSI: ffffffff8b9e6fc0 RDI: ffffffff8b9e6f80
RBP: ffff88802e8dc298 R08: 0000000000000000 R09: ffffffff8b038522
R10: dffffc0000000000 R11: ffffffff8b038450 R12: dffffc0000000000
R13: ffffffff8b038522 R14: ffff88802e8ccd80 R15: 0000000000000053
FS:  0000000000000000(0000) GS:ffff8880b8d7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdf19a2988 CR3: 000000010f6aa000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_is_watching+0x15/0xb0
 batadv_nc_worker+0x10c/0x610
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
