INFO: task syz.1.2905:20047 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2905 state:D stack:25840 pid:20047 ppid: 16176 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit kernel/sched/wait_bit.c:49 [inline]
out_of_line_wait_on_bit+0x173/0x230 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
__wait_on_buffer fs/buffer.c:122 [inline]
wait_on_buffer include/linux/buffer_head.h:390 [inline]
__bread_slow fs/buffer.c:1181 [inline]
__bread_gfp+0x2c2/0x380 fs/buffer.c:1384
sb_bread include/linux/buffer_head.h:337 [inline]
hfs_mdb_get+0x473/0x2180 fs/hfs/mdb.c:93
hfs_fill_super+0xe91/0x14c0 fs/hfs/super.c:406
mount_bdev+0x28a/0x3c0 fs/super.c:1400
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x247/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
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: 0033:0x7f9865733e99
RSP: 002b:00007f986394a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f98659bc180 RCX: 00007f9865733e99
RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00002000000000c0
RBP: 00007f98657c9eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98659bc218 R14: 00007f98659bc180 R15: 00007ffcff897628
INFO: task syz.4.2916:20097 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2916 state:D stack:26928 pid:20097 ppid: 16234 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit kernel/sched/wait_bit.c:49 [inline]
out_of_line_wait_on_bit+0x173/0x230 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
__wait_on_buffer fs/buffer.c:122 [inline]
wait_on_buffer include/linux/buffer_head.h:390 [inline]
__bread_slow fs/buffer.c:1181 [inline]
__bread_gfp+0x2c2/0x380 fs/buffer.c:1384
sb_bread include/linux/buffer_head.h:337 [inline]
hfs_mdb_get+0x473/0x2180 fs/hfs/mdb.c:93
hfs_fill_super+0xe91/0x14c0 fs/hfs/super.c:406
mount_bdev+0x28a/0x3c0 fs/super.c:1400
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x247/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
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: 0033:0x7f31ff84ce99
RSP: 002b:00007f31fda63028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f31ffad5180 RCX: 00007f31ff84ce99
RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00002000000000c0
RBP: 00007f31ff8e2eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31ffad5218 R14: 00007f31ffad5180 R15: 00007ffd7a7b2768
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c31ef20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by dhcpcd/3851:
#0: ffffffff8d44b148 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x256/0x1ba0 net/ipv4/devinet.c:1076
2 locks held by getty/3939:
#0: ffff88814c735098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002cf62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
2 locks held by kworker/u4:14/4534:
3 locks held by kworker/1:16/5299:
3 locks held by kworker/1:18/5301:
#0: ffff888016c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc9000356fd00 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffff888062cf7400 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x56/0xab0 drivers/net/netdevsim/dev.c:757
3 locks held by kworker/u4:18/6867:
#0: ffff888016c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc9000338fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d44b148 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251
1 lock held by syz.1.2905/20047:
#0: ffff888078d820e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
1 lock held by syz.4.2916/20097:
#0: ffff88804f7680e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
1 lock held by syz.0.2917/20111:
#0: ffff88804fbb60e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
1 lock held by syz.9.2927/20217:
#0: ffff88814c4fc0e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
1 lock held by syz.7.2936/20361:
#0: ffff8880748ba0e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
1 lock held by syz.8.2949/20574:
#0: ffff888032e1c0e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
1 lock held by syz.6.2985/20910:
#0: ffff888035af60e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
5 locks held by kworker/u4:41/21134:
#0: ffff888016dcd938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc90004897d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d43f210 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:589
#3: ffffffff8d44b148 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0xc7/0x4a0 net/ipv6/ip6_gre.c:1654
#4: ffffffff8c3239a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#4: ffffffff8c3239a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
2 locks held by syz.1.3048/21403:
#0: ffff88801d7f7010 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x80/0x3c0 fs/super.c:1367
#1: ffff888078d820e0 (&type->s_umount_key#99){+.+.}-{3:3}, at: grab_super+0x53/0x190 fs/super.c:389
1 lock held by syz.2.3079/21588:
#0: ffff88803efe00e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
1 lock held by syz.5.3103/21699:
#0: ffff88804be160e0 (&type->s_umount_key#98/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
7 locks held by syz-executor/21705:
#0: ffff88802cf84460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x296/0xd70 fs/read_write.c:590
#1: ffff88807d555488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1dc/0x500 fs/kernfs/file.c:287
#2: ffff8880239010f0 (kn->active#284){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1fd/0x500 fs/kernfs/file.c:288
#3: ffffffff8cd88da8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd3/0x3a0 drivers/net/netdevsim/bus.c:344
#4: ffff88802539b178 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:809 [inline]
#4: ffff88802539b178 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1064 [inline]
#4: ffff88802539b178 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa1/0x710 drivers/base/dd.c:1279
#5: ffff888062cf7400 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1359 [inline]
#5: ffff888062cf7400 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_reload_destroy+0x109/0x230 drivers/net/netdevsim/dev.c:1561
#6: ffffffff8d44b148 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x8dd/0xac0 net/core/dev.c:10722
1 lock held by syz-executor/21719:
#0: ffffffff8d44b148 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffffffff8d44b148 (rtnl_mutex){+.+.}-{3:3}, at: __rtnl_newlink net/core/rtnetlink.c:3480 [inline]
#0: ffffffff8d44b148 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_newlink+0xa26/0x1920 net/core/rtnetlink.c:3578
3 locks held by syz.4.3110/21724:
#0: ffff88803b7f93f0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x5f/0x1020 net/bluetooth/hci_core.c:1755
#1: ffff88803b7f8478 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x408/0x1020 net/bluetooth/hci_core.c:1800
#2: ffffffff8d591268 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1519 [inline]
#2: ffffffff8d591268 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa4/0x220 net/bluetooth/hci_conn.c:1622
3 locks held by syz.3.3111/21723:
#0: ffff8880515813f0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x5f/0x1020 net/bluetooth/hci_core.c:1755
#1: ffff888051580478 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x408/0x1020 net/bluetooth/hci_core.c:1800
#2: ffffffff8d591268 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1519 [inline]
#2: ffffffff8d591268 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa4/0x220 net/bluetooth/hci_conn.c:1622
=============================================
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 05/09/2026
Call Trace:
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+0xe1b/0xe60 kernel/hung_task.c:369
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11028 Comm: kworker/u4:34 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_wait_context kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_acquire+0x9a0/0x7b50 kernel/locking/lockdep.c:4962
Code: 4c 89 f0 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 e6 00 00 00 41 0f b6 06 84 c0 74 0e 41 0f b6 cd 44 0f b6 e8 38 c1 44 0f 42 e9 <48> 8b 44 24 60 42 0f b6 04 00 84 c0 0f 85 e3 00 00 00 48 ff c3 48
RSP: 0018:ffffc9000368f7a0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815ce670
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901e91b0
RBP: ffffc9000368f9d0 R08: dffffc0000000000 R09: 1ffffffff203d236
R10: dffffc0000000000 R11: fffffbfff203d237 R12: ffff888029b86450
R13: ffff888029b85904 R14: ffffffff8fbcb1b8 R15: ffff888029b86450
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005577cf0f1a38 CR3: 000000007e68f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000be70000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x32/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:369 [inline]
batadv_nc_purge_paths+0xe2/0x3a0 net/batman-adv/network-coding.c:446
batadv_nc_worker+0x321/0x5c0 net/batman-adv/network-coding.c:726
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287