INFO: task syz-executor.2:8981 blocked for more than 143 seconds. Not tainted 6.9.0-rc4-syzkaller-00329-g48cf398f15fc #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23648 pid:8981 tgid:8981 ppid:1 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 bit_wait+0x15/0xe0 kernel/sched/wait_bit.c:199 __wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0xda/0x110 kernel/sched/wait_bit.c:64 wait_on_bit include/linux/wait_bit.h:76 [inline] wait_on_bit include/linux/wait_bit.h:71 [inline] gfs2_glock_wait+0xe7/0x330 fs/gfs2/glock.c:1354 gfs2_glock_nq+0x946/0x1cd0 fs/gfs2/glock.c:1616 gfs2_glock_nq_init fs/gfs2/glock.h:238 [inline] __gfs2_lookup+0x111/0x290 fs/gfs2/inode.c:905 __lookup_slow+0x24f/0x460 fs/namei.c:1692 lookup_slow fs/namei.c:1709 [inline] walk_component+0x350/0x5b0 fs/namei.c:2004 lookup_last fs/namei.c:2461 [inline] path_lookupat+0x17f/0x770 fs/namei.c:2485 filename_lookup+0x1e5/0x5b0 fs/namei.c:2514 user_path_at_empty+0x42/0x60 fs/namei.c:2921 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1916 [inline] __do_sys_umount fs/namespace.c:1924 [inline] __se_sys_umount fs/namespace.c:1922 [inline] __x64_sys_umount+0x10e/0x1a0 fs/namespace.c:1922 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2dd4a7f1d7 RSP: 002b:00007ffeb5a08858 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 00007f2dd4ac93b9 RCX: 00007f2dd4a7f1d7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffeb5a08910 RBP: 00007ffeb5a08910 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffeb5a09a00 R13: 00007f2dd4ac93b9 R14: 0000555560bbc430 R15: 000000000000000a Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 2 locks held by kworker/u8:4/60: #0: ffff888015089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1296/0x1ac0 kernel/workqueue.c:3229 #1: ffffc900015b7d80 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1ac0 kernel/workqueue.c:3230 2 locks held by getty/4826: #0: ffff88802eaa90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201 1 lock held by syz-executor.2/8981: #0: ffff888058f90150 (&type->i_mutex_dir_key#22){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:805 [inline] #0: ffff888058f90150 (&type->i_mutex_dir_key#22){++++}-{3:3}, at: lookup_slow fs/namei.c:1708 [inline] #0: ffff888058f90150 (&type->i_mutex_dir_key#22){++++}-{3:3}, at: walk_component+0x342/0x5b0 fs/namei.c:2004 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc4-syzkaller-00329-g48cf398f15fc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf86/0x1240 kernel/hung_task.c:380 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2448 Comm: kworker/u8:7 Not tainted 6.9.0-rc4-syzkaller-00329-g48cf398f15fc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: bat_events batadv_mcast_mla_update RIP: 0010:write_comp_data+0x34/0x90 kernel/kcov.c:236 Code: 48 8b 15 ff 1b 76 7e 65 8b 05 00 1c 76 7e a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 82 14 16 00 00 85 c0 74 4f 8b 82 f0 15 00 00 <83> f8 03 75 44 48 8b 82 f8 15 00 00 8b 92 f4 15 00 00 48 8b 38 48 RSP: 0018:ffffc9000a0476a8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc9000a047730 RCX: ffffffff813d190d RDX: ffff8880298c9e00 RSI: 000000000000de83 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000004 R09: 000000000000de83 R10: 00000000000a0000 R11: 0000000000000002 R12: ffffffff81de83c8 R13: 000000000000de83 R14: 00000000000a0000 R15: ffffc9000a047765 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00013e000 CR3: 000000000d57a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:211 [inline] unwind_next_frame+0x23d/0x23a0 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x129/0x390 mm/slub.c:4390 batadv_mcast_mla_list_free net/batman-adv/multicast.c:670 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:927 [inline] batadv_mcast_mla_update+0x151f/0x3200 net/batman-adv/multicast.c:949 process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244