INFO: task syz.4.1859:13288 blocked for more than 143 seconds.
Tainted: G U 6.14.0-rc2-syzkaller-00039-g09fbf3d50205 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1859 state:D stack:27088 pid:13288 tgid:13284 ppid:11437 task_flags:0x400140 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5377 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6764
__schedule_loop kernel/sched/core.c:6841 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6856
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6913
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x6bd/0xb10 kernel/locking/mutex.c:730
expkey_flush+0x18/0x90 fs/nfsd/export.c:252
write_flush.constprop.0+0x2a1/0x3a0 net/sunrpc/cache.c:1549
pde_write fs/proc/inode.c:330 [inline]
proc_reg_write+0x23d/0x330 fs/proc/inode.c:342
do_loop_readv_writev fs/read_write.c:843 [inline]
do_loop_readv_writev fs/read_write.c:828 [inline]
vfs_writev+0x6da/0xdd0 fs/read_write.c:1052
do_writev+0x133/0x340 fs/read_write.c:1096
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f210518cde9
RSP: 002b:00007f2102fd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f21053a6080 RCX: 00007f210518cde9
RDX: 000000000000000a RSI: 0000400000000200 RDI: 0000000000000004
RBP: 00007f210520e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f21053a6080 R15: 00007ffca0199118
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e1bc140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e1bc140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1bc140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
2 locks held by kworker/u8:13/7601:
#0: ffff88801ef03148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x12cd/0x1b30 kernel/workqueue.c:3211
#1: ffffc9000b677d18 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3212
5 locks held by kworker/u8:27/7617:
#0: ffff88801bef5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x12cd/0x1b30 kernel/workqueue.c:3211
#1: ffffc9000b5b7d18 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3212
#2: ffffffff8fec2e90 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xca/0xbf0 net/core/net_namespace.c:606
#3: ffffffff8fed8e68 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x512/0xbf0 net/core/net_namespace.c:642
#4: ffffffff8e1c75b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:302
2 locks held by syz.2.1779/12955:
#0: ffffffff8ff79370 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8e5bda88 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1629
3 locks held by syz.4.1859/13288:
#0: ffff88807b6349b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x267/0x390 fs/file.c:1192
#1: ffff88803b7ca420 (sb_writers#3){.+.+}-{0:0}, at: do_writev+0x133/0x340 fs/read_write.c:1096
#2: ffffffff8e5bda88 (nfsd_mutex){+.+.}-{4:4}, at: expkey_flush+0x18/0x90 fs/nfsd/export.c:252
2 locks held by syz.3.1927/13654:
#0: ffff88807e4400e0 (&type->s_umount_key#51){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807e4400e0 (&type->s_umount_key#51){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807e4400e0 (&type->s_umount_key#51){+.+.}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505
#1: ffffffff8e5bda88 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:596
2 locks held by syz.5.1989/14076:
#0: ffffffff8ff79370 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8e5bda88 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1629
2 locks held by getty/14109:
#0: ffff8880318ef0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000348b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
2 locks held by syz.8.2155/15199:
#0: ffffffff8ff79370 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8e5bda88 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1629
3 locks held by syz.7.2242/15608:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G U 6.14.0-rc2-syzkaller-00039-g09fbf3d50205 #0
Tainted: [U]=USER
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+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf62/0x12b0 kernel/hung_task.c:399
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 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: 64 Comm: kworker/u8:4 Tainted: G U 6.14.0-rc2-syzkaller-00039-g09fbf3d50205 #0
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4868 [inline]
RIP: 0010:__lock_acquire+0x53d/0x3c40 kernel/locking/lockdep.c:5178
Code: a4 d5 11 0b 00 00 eb 10 83 eb 01 49 83 ec 28 83 fb ff 0f 84 a2 0b 00 00 49 8d 4c 24 df 4c 89 e2 4c 89 e6 48 c1 ea 03 83 e6 07 <0f> b6 14 2a 40 38 f2 7f 08 84 d2 0f 85 19 23 00 00 0f b6 51 21 44
RSP: 0018:ffffc9000215f8f8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff88801cb04718
RDX: 1ffff110039608e7 RSI: 0000000000000001 RDI: ffff88801cb04761
RBP: dffffc0000000000 R08: 0000000000000002 R09: fffffbfff2dc4998
R10: ffffffff96e24cc7 R11: 0000000000000002 R12: ffff88801cb04739
R13: ffff88801cb03c00 R14: 0000000000000000 R15: ffff88801cb04740
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe36bf79178 CR3: 000000002a3b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0x16a/0x1060 net/batman-adv/network-coding.c:719
process_one_work+0x958/0x1b30 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244