syzbot


INFO: task hung in f2fs_file_write_iter (2)

Status: auto-obsoleted due to no activity on 2024/02/14 19:21
Subsystems: f2fs
[Documentation on labels]
First crash: 244d, last: 244d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in f2fs_file_write_iter f2fs 5 502d 605d 0/1 upstream: reported on 2022/11/20 07:00
upstream INFO: task hung in f2fs_file_write_iter f2fs 5 405d 501d 0/27 auto-obsoleted due to no activity on 2023/09/06 20:28

Sample crash report:
INFO: task syz-executor.1:26528 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:28368 pid:26528 tgid:26515 ppid:5090   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 inode_lock include/linux/fs.h:802 [inline]
 f2fs_file_write_iter+0x29a/0x23a0 fs/f2fs/file.c:4778
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x792/0xb20 fs/read_write.c:584
 ksys_write+0x1a0/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f433947cae9
RSP: 002b:00007f433a2420c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f433959c050 RCX: 00007f433947cae9
RDX: 0000000000248800 RSI: 0000000020000200 RDI: 0000000000000006
RBP: 00007f43394c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f433959c050 R15: 00007fffc2a52308
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
2 locks held by kworker/u4:8/2440:
4 locks held by kworker/u4:9/2459:
 #0: ffff88801526f538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #0: ffff88801526f538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
 #1: ffffc90009fd7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #1: ffffc90009fd7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
 #2: ffff88807f0ec0e0 (&type->s_umount_key#54){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:610
 #3: ffff8880776dd2a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2133 [inline]
 #3: ffff8880776dd2a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x500/0x730 fs/f2fs/segment.c:437
2 locks held by getty/4812:
 #0: ffff88814b1430a0 (&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+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.3/5101:
 #0: ffffffff8d932a38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
 #0: ffffffff8d932a38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x46c/0x890 kernel/rcu/tree_exp.h:996
2 locks held by kworker/0:7/5215:
 #0: ffff888012c72938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #0: ffff888012c72938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
 #1: ffffc90002d2fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #1: ffffc90002d2fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
4 locks held by kworker/u4:11/16522:
 #0: ffff88801526f538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #0: ffff88801526f538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
 #1: ffffc9000536fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #1: ffffc9000536fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
 #2: ffff888080ce00e0 (&type->s_umount_key#54){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:610
 #3: ffff88801f8bd2a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2133 [inline]
 #3: ffff88801f8bd2a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x500/0x730 fs/f2fs/segment.c:437
5 locks held by syz-executor.1/26516:
3 locks held by syz-executor.1/26528:
 #0: ffff8880252bc348 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2b0/0x340 fs/file.c:1177
 #1: ffff88807f0ec418 (sb_writers#14){.+.+}-{0:0}, at: vfs_write+0x223/0xb20 fs/read_write.c:580
 #2: ffff8880393aad88 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #2: ffff8880393aad88 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: f2fs_file_write_iter+0x29a/0x23a0 fs/f2fs/file.c:4778
8 locks held by syz-executor.5/26638:
3 locks held by syz-executor.5/26646:
 #0: ffff88801af94ac8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2b0/0x340 fs/file.c:1177
 #1: ffff888080ce0418 (sb_writers#14){.+.+}-{0:0}, at: vfs_write+0x223/0xb20 fs/read_write.c:580
 #2: ffff888034f79300 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #2: ffff888034f79300 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: f2fs_file_write_iter+0x29a/0x23a0 fs/f2fs/file.c:4778
3 locks held by syz-executor.1/27235:
1 lock held by syz-executor.4/27238:
 #0: ffff8880b983c358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
5 locks held by syz-executor.4/27239:
3 locks held by syz-executor.4/27248:
 #0: ffff888025ae45c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2b0/0x340 fs/file.c:1177
 #1: ffff888029f56418 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x223/0xb20 fs/read_write.c:580
 #2: ffff88803f96a200 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #2: ffff88803f96a200 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_dio_write_iter fs/ext4/file.c:528 [inline]
 #2: ffff88803f96a200 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_file_write_iter+0x37a/0x19b0 fs/ext4/file.c:694

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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+0x198/0x310 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12 Comm: kworker/u4:1 Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:unwind_next_frame+0x1b8/0x29e0 arch/x86/kernel/unwind_orc.c:494
Code: 2a 48 8b 44 24 30 42 80 3c 30 00 74 08 48 89 df e8 cd ad ac 00 48 03 2b 48 8d 75 ff 31 ff e8 1f d3 50 00 48 ff cd 4c 89 24 24 <4c> 89 7c 24 70 4c 89 6c 24 48 0f 84 41 01 00 00 48 c7 c3 00 00 00
RSP: 0018:ffffc900001175e8 EFLAGS: 00000283
RAX: 0000000000000000 RBX: ffffc90000117708 RCX: ffff888016275940
RDX: ffffc900001176f5 RSI: ffffffff81ea3045 RDI: 0000000000000000
RBP: ffffffff81ea3045 R08: ffffffff813dafd1 R09: ffffc900001177b0
R10: 0000000000000003 R11: ffff888016275940 R12: ffffc900001176c0
R13: ffffc90000117710 R14: dffffc0000000000 R15: ffffffff81ea3046
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f566dd77978 CR3: 0000000030ed1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0x146/0x1a0 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+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1800 [inline]
 slab_free_freelist_hook mm/slub.c:1826 [inline]
 slab_free mm/slub.c:3809 [inline]
 kmem_cache_free+0x299/0x470 mm/slub.c:3831
 kfree_skb include/linux/skbuff.h:1234 [inline]
 ieee80211_iface_work+0x26c/0xd90 net/mac80211/iface.c:1645
 cfg80211_wiphy_work+0x21e/0x250 net/wireless/core.c:435
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2703
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/16 19:18 upstream 7475e51b8796 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in f2fs_file_write_iter
* Struck through repros no longer work on HEAD.