syzbot

INFO: task syz.0.27:4633 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.27        state:D stack:25464 pid: 4633 ppid:  4616 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 rwsem_down_read_slowpath+0x548/0x9d0 kernel/locking/rwsem.c:1055
 __down_read_common kernel/locking/rwsem.c:1239 [inline]
 __down_read kernel/locking/rwsem.c:1252 [inline]
 down_read+0x96/0x2e0 kernel/locking/rwsem.c:1500
 iterate_supers+0xa4/0x1d0 fs/super.c:716
 quota_sync_all fs/quota/quota.c:68 [inline]
 __do_sys_quotactl fs/quota/quota.c:936 [inline]
 __se_sys_quotactl+0x33b/0x6f0 fs/quota/quota.c:915
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f92b85e7e59
RSP: 002b:00007f92b7c49028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f92b8860fa0 RCX: 00007f92b85e7e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f92b867dd6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f92b8861038 R14: 00007f92b8860fa0 R15: 00007ffc7de04fb8
 </TASK>

Showing all locks held in the system:
1 lock held by ksoftirqd/0/14:
 #0: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
1 lock held by khungtaskd/27:
 #0: ffffffff8c31f320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3948:
 #0: ffff88802cd53098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900026562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
4 locks held by syz.0.17/4380:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: do_remount fs/namespace.c:2694 [inline]
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: path_mount+0xd0e/0x1030 fs/namespace.c:3356
 #1: ffffc900032010f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #1: ffffc900032010f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
 #1: ffffc900032010f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x304/0x42d0 fs/reiserfs/journal.c:4025
 #2: ffffc90003201180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #2: ffffc90003201180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: flush_journal_list+0x180/0x1ba0 fs/reiserfs/journal.c:1366
 #3: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
4 locks held by syz.1.18/4410:
4 locks held by syz.2.19/4428:
4 locks held by syz.3.20/4446:
 #0: ffff888146e8a0e0 (&type->s_umount_key#53){++++}-{3:3}, at: do_remount fs/namespace.c:2694 [inline]
 #0: ffff888146e8a0e0 (&type->s_umount_key#53){++++}-{3:3}, at: path_mount+0xd0e/0x1030 fs/namespace.c:3356
 #1: ffffc900035810f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #1: ffffc900035810f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
 #1: ffffc900035810f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x304/0x42d0 fs/reiserfs/journal.c:4025
 #2: ffffc90003581180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #2: ffffc90003581180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: flush_journal_list+0x180/0x1ba0 fs/reiserfs/journal.c:1366
 #3: ffff88802b96c090 (&jl->j_commit_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #3: ffff88802b96c090 (&jl->j_commit_mutex){+.+.}-{3:3}, at: flush_commit_list+0x6de/0x1d70 fs/reiserfs/journal.c:1005
2 locks held by kworker/u4:6/4475:
4 locks held by syz.4.21/4478:
4 locks held by syz.5.22/4500:
 #0: ffff88807cb4c0e0 (&type->s_umount_key#53){++++}-{3:3}, at: do_remount fs/namespace.c:2694 [inline]
 #0: ffff88807cb4c0e0 (&type->s_umount_key#53){++++}-{3:3}, at: path_mount+0xd0e/0x1030 fs/namespace.c:3356
 #1: ffffc900037110f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #1: ffffc900037110f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
 #1: ffffc900037110f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x304/0x42d0 fs/reiserfs/journal.c:4025
 #2: ffffc90003711180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #2: ffffc90003711180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: flush_journal_list+0x180/0x1ba0 fs/reiserfs/journal.c:1366
 #3: ffff8880b913a358 (&rq->__lock){-.-.}-{2:2}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #3: ffff8880b913a358 (&rq->__lock){-.-.}-{2:2}, at: flush_commit_list+0x6de/0x1d70 fs/reiserfs/journal.c:1005
4 locks held by syz.6.23/4524:
 #0: ffff888077d300e0 (&type->s_umount_key#53){++++}-{3:3}, at: do_remount fs/namespace.c:2694 [inline]
 #0: ffff888077d300e0 (&type->s_umount_key#53){++++}-{3:3}, at: path_mount+0xd0e/0x1030 fs/namespace.c:3356
 #1: ffffc900037e10f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #1: ffffc900037e10f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
 #1: ffffc900037e10f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x304/0x42d0 fs/reiserfs/journal.c:4025
 #2: ffffc900037e1180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #2: ffffc900037e1180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: flush_journal_list+0x180/0x1ba0 fs/reiserfs/journal.c:1366
 #3: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
3 locks held by kworker/u4:8/4527:
4 locks held by syz.7.24/4557:
4 locks held by syz.8.25/4584:
 #0: ffff88805df720e0 (&type->s_umount_key#53){++++}-{3:3}, at: do_remount fs/namespace.c:2694 [inline]
 #0: ffff88805df720e0 (&type->s_umount_key#53){++++}-{3:3}, at: path_mount+0xd0e/0x1030 fs/namespace.c:3356
 #1: ffffc90003be10f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #1: ffffc90003be10f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
 #1: ffffc90003be10f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x304/0x42d0 fs/reiserfs/journal.c:4025
 #2: ffffc90003be1180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #2: ffffc90003be1180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: flush_journal_list+0x180/0x1ba0 fs/reiserfs/journal.c:1366
 #3: ffff8880b913a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
4 locks held by syz.9.26/4608:
 #0: ffff88802c97c0e0 (&type->s_umount_key#53){++++}-{3:3}, at: do_remount fs/namespace.c:2694 [inline]
 #0: ffff88802c97c0e0 (&type->s_umount_key#53){++++}-{3:3}, at: path_mount+0xd0e/0x1030 fs/namespace.c:3356
 #1: ffffc90003cd10f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #1: ffffc90003cd10f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
 #1: ffffc90003cd10f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x304/0x42d0 fs/reiserfs/journal.c:4025
 #2: ffffc90003cd1180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #2: ffffc90003cd1180 (&journal->j_flush_mutex){+.+.}-{3:3}, at: flush_journal_list+0x180/0x1ba0 fs/reiserfs/journal.c:1366
 #3: ffff888079797c90 (&jl->j_commit_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
 #3: ffff888079797c90 (&jl->j_commit_mutex){+.+.}-{3:3}, at: flush_commit_list+0x6de/0x1d70 fs/reiserfs/journal.c:1005
2 locks held by kworker/u4:10/4626:
1 lock held by syz.0.27/4633:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
1 lock held by syz.1.28/4650:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
1 lock held by syz.2.29/4666:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
1 lock held by syz.3.30/4688:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
1 lock held by syz.4.31/4712:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
1 lock held by syz.5.32/4742:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
1 lock held by syz.6.33/4766:
 #0: ffff88807be440e0 (&type->s_umount_key#53){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4626 Comm: kworker/u4:10 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_sta_get_rates+0x40c/0x6b0 net/mac80211/util.c:2139
Code: 00 00 89 de e8 45 b7 27 f8 83 fb 3f 0f 87 a0 00 00 00 41 be 01 00 00 00 89 d9 49 d3 e6 48 8b 44 24 20 44 09 f0 48 89 44 24 20 <80> 7c 24 07 00 74 1d e8 b8 b3 27 f8 e9 66 ff ff ff e8 ae b3 27 f8
RSP: 0018:ffffc90003d4f8b8 EFLAGS: 00000206
RAX: 000000000000000f RBX: 0000000000000003 RCX: 0000000000000003
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000040
RBP: 000000000000006e R08: ffffffff8d89f82f R09: 1ffffffff1b13f05
R10: dffffc0000000000 R11: fffffbfff1b13f06 R12: 000000000000000b
R13: 000000000000006e R14: 0000000000000008 R15: ffff8880787a33b0
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6b1f13000 CR3: 0000000075bec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ieee80211_update_sta_info net/mac80211/ibss.c:1007 [inline]
 ieee80211_rx_bss_info net/mac80211/ibss.c:1121 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
 ieee80211_ibss_rx_queued_mgmt+0xf5f/0x2ab0 net/mac80211/ibss.c:1643
 ieee80211_iface_process_skb net/mac80211/iface.c:1459 [inline]
 ieee80211_iface_work+0x70e/0xc60 net/mac80211/iface.c:1513
 cfg80211_wiphy_work+0x221/0x260 net/wireless/core.c:433
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>