INFO: task syz-executor.3:7392 blocked for more than 143 seconds. Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:24976 pid:7392 tgid:7391 ppid:5953 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x1796/0x4a00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:53 iterate_supers+0xc6/0x190 fs/super.c:922 ksys_sync+0xdb/0x1c0 fs/sync.c:104 __do_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f977487dea9 RSP: 002b:00007f97756b30c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f97749abf80 RCX: 00007f977487dea9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f97748ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f97749abf80 R15: 00007ffcf5966298 Showing all locks held in the system: 4 locks held by kworker/0:0/7: #0: ffff8880b943e658 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559 #1: ffff8880b9428948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988 #2: ffffffff9494afd8 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:978 [inline] #2: ffffffff9494afd8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x234/0x580 lib/debugobjects.c:1019 #3: ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 kernel/time/timer.c:1165 1 lock held by khungtaskd/29: #0: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by kworker/u8:6/1059: #0: ffff88801cb21948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff88801cb21948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3335 #1: ffffc900048f7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900048f7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3335 2 locks held by kworker/u8:7/1103: #0: ffff88801cb21948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff88801cb21948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3335 #1: ffffc90004c37d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90004c37d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3335 2 locks held by getty/4825: #0: ffff88802a98e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 3 locks held by syz-executor.2/5863: 1 lock held by syz-executor.2/5873: 3 locks held by syz-executor.4/6365: 2 locks held by syz-executor.0/7109: 2 locks held by syz-executor.3/7392: #0: ffff8880425240e0 (&type->s_umount_key#66){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880425240e0 (&type->s_umount_key#66){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880425220e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:53 2 locks held by syz-executor.1/7601: #0: ffff8880425240e0 (&type->s_umount_key#66){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880425240e0 (&type->s_umount_key#66){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880425220e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:53 1 lock held by syz-executor.4/9024: 2 locks held by syz-executor.2/9026: 1 lock held by syz-executor.0/9032: 2 locks held by syz-executor.3/9035: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #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+0x241/0x360 lib/dump_stack.c:114 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xfde/0x1020 kernel/hung_task.c:380 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/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: 7109 Comm: syz-executor.0 Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:__sanitizer_cov_trace_cmp8+0x7d/0x90 kernel/kcov.c:285 Code: c1 e1 05 48 8d 41 28 4c 39 c8 77 1e 49 ff c2 4c 89 12 48 c7 44 11 08 06 00 00 00 48 89 7c 11 10 48 89 74 11 18 4c 89 44 11 20 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 RSP: 0018:ffffc9000327f7b0 EFLAGS: 00000297 RAX: 0000000000000002 RBX: ffff8880b1cf8500 RCX: ffff888027a8da00 RDX: ffffc900116eb000 RSI: ffff8880b1cf8500 RDI: 0000000031cf8500 RBP: ffff88801edb3dc0 R08: ffffffff81429e4b R09: ffffffff81f72083 R10: dffffc0000000000 R11: fffffbfff25df6a6 R12: ffff8880162a7c80 R13: ffff888082790000 R14: 0000000031cf8500 R15: ffff8880162a7c80 FS: 00007fe8e1f576c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5727fad988 CR3: 00000000249dc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __phys_addr+0x4b/0x170 arch/x86/mm/physaddr.c:28 virt_to_folio include/linux/mm.h:1304 [inline] virt_to_slab+0x5/0xb0 mm/slab.h:204 ___cache_free+0x1a/0x80 mm/slub.c:4300 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x174/0x340 mm/slub.c:3852 kmem_cache_zalloc include/linux/slab.h:739 [inline] alloc_buffer_head+0x2d/0x2a0 fs/buffer.c:3001 folio_alloc_buffers+0x2da/0x840 fs/buffer.c:924 create_empty_buffers+0x3a/0x740 fs/buffer.c:1650 block_read_full_folio+0x258/0xe10 fs/buffer.c:2365 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2331 do_read_cache_folio+0x134/0x820 mm/filemap.c:3747 do_read_cache_page+0x30/0x200 mm/filemap.c:3813 read_mapping_page include/linux/pagemap.h:888 [inline] dir_get_page fs/sysv/dir.c:64 [inline] sysv_readdir+0x190/0x3e0 fs/sysv/dir.c:92 iterate_dir+0x539/0x6f0 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:409 [inline] __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:394 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe8e127dea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe8e1f570c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fe8e13abf80 RCX: 00007fe8e127dea9 RDX: 0000000000001000 RSI: 0000000020000f80 RDI: 0000000000000009 RBP: 00007fe8e12ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fe8e13abf80 R15: 00007ffe125160c8