syzbot

INFO: task syz.4.394:9205 blocked for more than 143 seconds.
      Not tainted 6.12.0-syzkaller-00971-g158f238aa69d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.394       state:D stack:23520 pid:9205  tgid:9201  ppid:5841   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6693
 __schedule_loop kernel/sched/core.c:6770 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6785
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6842
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
 inode_lock include/linux/fs.h:818 [inline]
 finish_preallocate_blocks fs/f2fs/file.c:559 [inline]
 f2fs_file_open+0x11b/0x3a0 fs/f2fs/file.c:612
 do_dentry_open+0x978/0x1460 fs/open.c:941
 vfs_open+0x3e/0x330 fs/open.c:1071
 do_open fs/namei.c:3828 [inline]
 path_openat+0x2c84/0x3590 fs/namei.c:3987
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1398
 do_sys_open fs/open.c:1413 [inline]
 __do_sys_openat fs/open.c:1429 [inline]
 __se_sys_openat fs/open.c:1424 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1424
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe69eb7e759
RSP: 002b:00007fe69f8ea038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe69ed36130 RCX: 00007fe69eb7e759
RDX: 0000000000020242 RSI: 0000000020000380 RDI: ffffffffffffff9c
RBP: 00007fe69ebf175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe69ed36130 R15: 00007ffd1a82bce8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e939f60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e939f60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e939f60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
2 locks held by getty/5589:
 #0: ffff88814d93e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/6094:
 #0: ffff88807b0720e0 (&type->s_umount_key#31){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807b0720e0 (&type->s_umount_key#31){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88807b0720e0 (&type->s_umount_key#31){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
4 locks held by kworker/u8:8/6131:
 #0: ffff8880202b9148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff8880202b9148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: ffffc9000c3cfd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc9000c3cfd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
 #2: ffff8880635fc0e0 (&type->s_umount_key#64){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562
 #3: ffff888033a71350 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2199 [inline]
 #3: ffff888033a71350 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x5b0/0x7a0 fs/f2fs/segment.c:448
7 locks held by syz.4.394/9203:
2 locks held by syz.4.394/9205:
 #0: ffff8880635fc420 (sb_writers#18){++++}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
 #1: ffff88805ac7ad30 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:818 [inline]
 #1: ffff88805ac7ad30 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: finish_preallocate_blocks fs/f2fs/file.c:559 [inline]
 #1: ffff88805ac7ad30 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: f2fs_file_open+0x11b/0x3a0 fs/f2fs/file.c:612
1 lock held by syz-executor/9358:
 #0: ffffffff8e93f4f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
 #0: ffffffff8e93f4f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
3 locks held by syz-executor/9606:
1 lock held by syz.3.592/10725:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-syzkaller-00971-g158f238aa69d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9203 Comm: syz.4.394 Not tainted 6.12.0-syzkaller-00971-g158f238aa69d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:123 [inline]
RIP: 0010:kasan_quarantine_put+0x27/0x230 mm/kasan/quarantine.c:207
Code: 90 90 90 66 0f 1f 00 41 57 41 56 41 55 41 54 53 50 49 89 fe e8 da e9 ff ff 48 85 c0 74 6b 48 89 c3 48 c7 04 24 00 00 00 00 9c <8f> 04 24 4c 8b 3c 24 fa 41 f7 c7 00 02 00 00 74 05 e8 b3 f7 a0 ff
RSP: 0018:ffffc90000a18b80 EFLAGS: 00000286
RAX: ffff88804f1089a0 RBX: ffff88804f1089a0 RCX: 00000000000000e0
RDX: ffff88804f1089a0 RSI: ffff88804f1088c0 RDI: ffff888142aaf000
RBP: 0000000000000000 R08: ffffc90000a18960 R09: 000000000000000a
R10: dffffc0000000000 R11: fffffbfff285512e R12: ffff88804f1088c0
R13: ffff8880543e1788 R14: ffff888142aaf000 R15: ffff888142aaf000
FS:  00007fe69f92c6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f66ec33a19c CR3: 000000005ee06000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free_after_rcu_debug+0x11c/0x290 mm/slub.c:4629
 rcu_do_batch kernel/rcu/tree.c:2567 [inline]
 rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2042 [inline]
RIP: 0010:vprintk_emit+0x700/0xa10 kernel/printk/printk.c:2406
Code: 00 e8 94 c8 20 00 4c 8d bc 24 a0 00 00 00 4d 85 e4 75 07 e8 82 c8 20 00 eb 06 e8 7b c8 20 00 fb 49 bc 00 00 00 00 00 fc ff df <48> c7 c7 60 55 81 8e 31 f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00
RSP: 0018:ffffc90012ce6420 EFLAGS: 00000293
RAX: ffffffff81742905 RBX: 0000000000000000 RCX: ffff88802e220000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90012ce6530 R08: ffffffff817428de R09: 1ffffffff285512d
R10: dffffc0000000000 R11: fffffbfff285512e R12: dffffc0000000000
R13: 1ffff9200259cc88 R14: ffffffff81742740 R15: ffffc90012ce64c0
 _printk+0xd5/0x120 kernel/printk/printk.c:2432
 bio_check_eod block/blk-core.c:557 [inline]
 submit_bio_noacct+0xfcd/0x1910 block/blk-core.c:784
 f2fs_submit_page_read+0x121/0x190 fs/f2fs/data.c:1116
 f2fs_get_read_data_page+0x51c/0x8f0 fs/f2fs/data.c:1275
 f2fs_get_lock_data_page+0x54/0x350 fs/f2fs/data.c:1323
 move_data_page fs/f2fs/gc.c:1461 [inline]
 gc_data_segment fs/f2fs/gc.c:1685 [inline]
 do_garbage_collect+0x3c24/0x8200 fs/f2fs/gc.c:1829
 f2fs_gc+0xf90/0x2ff0 fs/f2fs/gc.c:1933
 f2fs_balance_fs+0x5f8/0x7a0 fs/f2fs/segment.c:450
 f2fs_map_blocks+0x44ec/0x4f10 fs/f2fs/data.c:1791
 f2fs_expand_inode_data+0x622/0xbb0 fs/f2fs/file.c:1811
 f2fs_fallocate+0x448/0x960 fs/f2fs/file.c:1914
 vfs_fallocate+0x569/0x6e0 fs/open.c:327
 do_vfs_ioctl+0x258c/0x2e40 fs/ioctl.c:885
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe69eb7e759
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:00007fe69f92c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe69ed35f80 RCX: 00007fe69eb7e759
RDX: 00000000200003c0 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 00007fe69ebf175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe69ed35f80 R15: 00007ffd1a82bce8
 </TASK>