INFO: task kworker/u8:0:11 blocked for more than 143 seconds. Not tainted 6.12.0-rc3-syzkaller-00319-gb04ae0f45168 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:21360 pid:11 tgid:11 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-7:3) Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752 jfs_commit_inode+0x24a/0x590 fs/jfs/inode.c:102 jfs_write_inode+0x143/0x220 fs/jfs/inode.c:132 write_inode fs/fs-writeback.c:1503 [inline] __writeback_single_inode+0x711/0x10d0 fs/fs-writeback.c:1723 writeback_sb_inodes+0x80c/0x1370 fs/fs-writeback.c:1954 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2025 wb_writeback+0x42f/0xbd0 fs/fs-writeback.c:2136 wb_check_start_all fs/fs-writeback.c:2262 [inline] wb_do_writeback fs/fs-writeback.c:2288 [inline] wb_workfn+0x980/0x1090 fs/fs-writeback.c:2321 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INFO: task syz.0.116:6511 blocked for more than 143 seconds. Not tainted 6.12.0-rc3-syzkaller-00319-gb04ae0f45168 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.116 state:D stack:23840 pid:6511 tgid:6510 ppid:5938 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:216 sync_inodes_sb+0x28d/0xb50 fs/fs-writeback.c:2799 iterate_supers+0xc6/0x190 fs/super.c:934 ksys_sync+0xbd/0x1c0 fs/sync.c:102 __do_sys_sync+0xe/0x20 fs/sync.c:113 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: 0033:0x7fa46657dff9 RSP: 002b:00007fa4672a4038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fa466735f80 RCX: 00007fa46657dff9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fa4665f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa466735f80 R15: 00007ffd7a2a6878 INFO: task syz.4.118:6534 blocked for more than 144 seconds. Not tainted 6.12.0-rc3-syzkaller-00319-gb04ae0f45168 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.118 state:D stack:27424 pid:6534 tgid:6512 ppid:5805 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578 bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 iterate_supers+0xc6/0x190 fs/super.c:934 ksys_sync+0xbd/0x1c0 fs/sync.c:102 __do_sys_sync+0xe/0x20 fs/sync.c:113 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: 0033:0x7f03aa97dff9 RSP: 002b:00007f03ab790038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f03aab36058 RCX: 00007f03aa97dff9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f03aa9f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f03aab36058 R15: 00007fff44377ce8 Showing all locks held in the system: 4 locks held by kworker/u8:0/11: #0: ffff88801e6ea948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801e6ea948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000107d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000107d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562 #3: ffff88807c1dafe0 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x24a/0x590 fs/jfs/inode.c:102 1 lock held by khungtaskd/30: #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 3 locks held by kworker/u8:2/35: #0: ffff88814c47f148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88814c47f148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000ab7d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000ab7d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcc0888 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4196 2 locks held by kworker/u8:5/795: 5 locks held by kworker/u8:6/1310: #0: ffff8880b863ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:593 #1: ffff8880b8628948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 kernel/sched/psi.c:987 #2: ffff8880b862a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1051 #3: ffffffff9a674848 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x16d/0x510 lib/debugobjects.c:708 #4: ffffffff9a647338 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:978 [inline] #4: ffffffff9a647338 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x234/0x580 lib/debugobjects.c:1019 3 locks held by kworker/1:2/2636: 3 locks held by kworker/u8:7/3826: 2 locks held by getty/4970: #0: ffff88814c6b60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 4 locks held by syz.3.115/6514: 2 locks held by syz.0.116/6511: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.4.118/6534: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.2.119/6586: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.1.134/6812: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.4.159/6913: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.2.164/6925: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.3.181/6981: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.1.229/7251: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.4.230/7255: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.0.239/7279: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.1.263/7390: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.3.268/7409: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 2 locks held by syz.4.309/7548: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 6 locks held by syz-executor/7591: 2 locks held by syz.2.333/7600: #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802f2ee0e0 (&type->s_umount_key#105){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:388 [inline] #1: ffff8881427da7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x26e/0xb50 fs/fs-writeback.c:2797 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00319-gb04ae0f45168 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 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 UID: 0 PID: 35 Comm: kworker/u8:2 Not tainted 6.12.0-rc3-syzkaller-00319-gb04ae0f45168 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:asm_exc_int3+0x0/0x40 arch/x86/include/asm/idtentry.h:622 Code: e9 e5 08 00 00 0f 1f 44 00 00 f3 0f 1e fa 0f 01 ca fc 6a ff e8 91 07 00 00 48 89 c4 48 89 e7 e8 e6 72 dd ff e9 c1 08 00 00 90 0f 1e fa 0f 01 ca fc 6a ff f6 44 24 10 03 75 18 ff 74 24 28 ff RSP: 0018:ffffc90000ab6ee8 EFLAGS: 00000082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000060 RDI: ffffffff8ea50540 RBP: 0000000000000048 R08: ffffffff8b0b8892 R09: ffffffff8b0b86cb R10: 0000000000000003 R11: ffff88801d6ebc00 R12: 0000000000000920 R13: ffff88801ac41280 R14: 0000000000000000 R15: ffffffff8b0b88ed FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a11aea000 CR3: 0000000078918000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline] RIP: 0010:kfence_alloc include/linux/kfence.h:121 [inline] RIP: 0010:slab_alloc_node mm/slub.c:4118 [inline] RIP: 0010:__do_kmalloc_node mm/slub.c:4263 [inline] RIP: 0010:__kmalloc_noprof+0xf0/0x400 mm/slub.c:4276 Code: 5d 75 ff 2e 2e 2e 31 c0 4c 89 ef 89 de e8 38 81 0c 00 31 db 85 c0 0f 85 05 01 00 00 4d 85 ed 0f 84 fc 00 00 00 48 89 2c 24 cc <1f> 44 00 00 65 48 8b 05 74 96 12 7e 49 8b 4d 00 48 8b 54 08 08 48 RSP: 0018:ffffc90000ab6f10 EFLAGS: 00000282