INFO: task syz.3.833:9886 blocked for more than 143 seconds.
Not tainted 6.14.0-rc2-syzkaller-00056-gab68d7eb7b1a #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.833 state:D stack:21368 pid:9886 tgid:9884 ppid:5823 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5377 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6764
__schedule_loop kernel/sched/core.c:6841 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6856
io_schedule+0x8d/0x110 kernel/sched/core.c:7689
folio_wait_bit_common+0x839/0xee0 mm/filemap.c:1318
folio_lock include/linux/pagemap.h:1163 [inline]
migrate_folio_unmap mm/migrate.c:1242 [inline]
migrate_pages_batch+0x1538/0x30b0 mm/migrate.c:1866
migrate_pages_sync mm/migrate.c:2016 [inline]
migrate_pages+0x2561/0x34a0 mm/migrate.c:2098
compact_zone+0x33d5/0x4ae0 mm/compaction.c:2663
compact_node mm/compaction.c:2932 [inline]
compact_nodes mm/compaction.c:2954 [inline]
sysctl_compaction_handler+0x496/0x990 mm/compaction.c:3005
proc_sys_call_handler+0x5ec/0x920 fs/proc/proc_sysctl.c:601
iter_file_splice_write+0xbfa/0x1510 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x11b/0x220 fs/splice.c:1164
splice_direct_to_actor+0x586/0xc80 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x289/0x3e0 fs/splice.c:1233
do_sendfile+0x564/0x8a0 fs/read_write.c:1363
__do_sys_sendfile64 fs/read_write.c:1418 [inline]
__se_sys_sendfile64+0x100/0x1e0 fs/read_write.c:1410
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: 0033:0x7f95b218cde9
RSP: 002b:00007f95affd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f95b23a6080 RCX: 00007f95b218cde9
RDX: 00004000000000c0 RSI: 0000000000000006 RDI: 0000000000000007
RBP: 00007f95b220e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f95b23a6080 R15: 00007ffe9671f6f8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
2 locks held by getty/5579:
#0: ffff88803537a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ff62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by udevd/5843:
#0: ffff8881443594c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xf0/0xc50 block/bdev.c:903
3 locks held by kworker/0:7/5906:
3 locks held by kworker/u8:10/6083:
1 lock held by syz.3.833/9886:
#0: ffff88807bc82420 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x220 fs/splice.c:1163
1 lock held by syz-executor/11058:
1 lock held by syz.1.1102/11317:
5 locks held by syz.7.1105/11336:
#0: ffffffff8f1805a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x54/0x340 drivers/char/misc.c:143
#1: ffffffff8e7eca68 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x60/0xa0 kernel/power/main.c:56
#2: ffffffff8e80c2f0 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0xac/0x1e0 kernel/notifier.c:344
#3: ffff88807b978d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_suspend_dev+0x1fb/0x3e0 net/bluetooth/hci_core.c:2810
#4: ffff88807b978078 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x1e4/0x11f0 net/bluetooth/hci_sync.c:5569
1 lock held by syz.5.1104/11334:
#0: ffffffff8e93dcb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:334 [inline]
#0: ffffffff8e93dcb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:996
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc2-syzkaller-00056-gab68d7eb7b1a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
__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:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8366 Comm: kworker/u8:18 Not tainted 6.14.0-rc2-syzkaller-00056-gab68d7eb7b1a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:hlock_class kernel/locking/lockdep.c:225 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4853 [inline]
RIP: 0010:__lock_acquire+0x588/0x2100 kernel/locking/lockdep.c:5178
Code: 00 00 fc ff df 90 0f 0b 90 90 90 31 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 f8 12 00 00 0f b6 2b <41> 0f b6 04 16 84 c0 0f 85 0c 13 00 00 41 8b 1f 81 e3 ff 1f 00 00
RSP: 0018:ffffc9000301f7b0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff93c99fd4 RCX: ffffffff819ab41c
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff942c6928
RBP: 0000000000000003 R08: ffffffff942c692f R09: 1ffffffff2858d25
R10: dffffc0000000000 R11: fffffbfff2858d26 R12: ffff88802d2564d4
R13: 000000000000000a R14: 1ffff11005a4acac R15: ffff88802d256560
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558b8df0e680 CR3: 000000000e738000 CR4: 00000000003526f0
DR0: 0000000000000002 DR1: ffffffffffffffff DR2: 0000000000010001
DR3: 0000000000000004 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
batadv_nc_purge_paths+0xe8/0x3b0 net/batman-adv/network-coding.c:442
batadv_nc_worker+0x365/0x610 net/batman-adv/network-coding.c:722
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
worker_thread+0x870/0xd30 kernel/workqueue.c:3398
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244