INFO: task syz-executor.5:5569 blocked for more than 143 seconds. Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:20272 pid:5569 tgid:5569 ppid:3130 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5376 [inline] __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0x149/0x260 kernel/sched/core.c:6778 wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x2d2/0x370 fs/fs-writeback.c:2672 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2720 ext4_nonda_switch fs/ext4/inode.c:2846 [inline] ext4_da_write_begin+0x22b/0xa50 fs/ext4/inode.c:2873 generic_perform_write+0x31b/0x630 mm/filemap.c:3918 ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1dc/0x19b0 __kernel_write_iter+0x306/0x720 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x46c/0x910 fs/coredump.c:915 elf_core_dump+0x3c97/0x4540 fs/binfmt_elf.c:2077 do_coredump+0x1b74/0x2ab0 fs/coredump.c:764 get_signal+0x146a/0x1840 kernel/signal.c:2890 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0xa/0x50 kernel/entry/common.c:309 exc_page_fault+0x57e/0x870 arch/x86/mm/fault.c:1564 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x83bd6bef94 RSP: 002b:0000000020000378 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f806ff9bf80 RCX: 00007f806fe7cae9 RDX: 0000000020000380 RSI: 0000000020000370 RDI: 000000000000c000 RBP: 00007f806fec847a R08: 0000000020000400 R09: 0000000020000400 R10: 00000000200003c0 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000000b R14: 00007f806ff9bf80 R15: 00007ffc59de41b8 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 5 locks held by kworker/u4:9/2871: #0: ffff88801ae49d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #0: ffff88801ae49d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703 #1: ffffc9000b6d7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #1: ffffc9000b6d7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703 #2: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #2: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #3: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #4: ffff88803936a088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 2 locks held by getty/4815: #0: ffff888026c630a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015972f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201 3 locks held by kworker/u4:1/10282: #0: ffff88802a779938 ((wq_completion)ext4-rsv-conversion){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #0: ffff88802a779938 ((wq_completion)ext4-rsv-conversion){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703 #1: ffffc900046bfd20 ((work_completion)(&ei->i_rsv_conversion_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #1: ffffc900046bfd20 ((work_completion)(&ei->i_rsv_conversion_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703 #2: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 3 locks held by syz-executor.5/5569: #0: ffff8880293de418 (sb_writers#4){.+.+}-{0:0}, at: do_coredump+0x1b4f/0x2ab0 fs/coredump.c:763 #1: ffff888055965e00 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff888055965e00 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0x97/0x350 fs/ext4/file.c:294 #2: ffff8880293de0e0 (&type->s_umount_key#30){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2717 3 locks held by syz-executor.3/5609: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff888039e37088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 2 locks held by syz-executor.2/6050: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 3 locks held by syz-executor.5/6118: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff888031ad7088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 3 locks held by syz-executor.0/6120: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff8880390a1688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 3 locks held by syz-executor.2/6125: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff888031ad5c88 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 3 locks held by syz-executor.3/6145: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff8880315a2a88 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 3 locks held by syz-executor.2/6148: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff888042d2e688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 3 locks held by syz-executor.5/6201: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff888035a55288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 3 locks held by syz-executor.2/6400: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff888029352950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2038/0x2290 fs/jbd2/transaction.c:463 #2: ffff888057952088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x959/0x1cd0 fs/ext4/inode.c:614 3 locks held by syz-executor.4/6437: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 #1: ffff8880b993c358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 #2: ffff8880b9928808 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988 1 lock held by syz-executor.2/6519: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.1/6583: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.4/6587: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.3/6642: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.2/6645: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.4/6653: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.0/6654: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.1/6656: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.0/6660: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.2/6664: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.3/6666: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.0/6670: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.1/6673: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 1 lock held by syz-executor.4/6681: #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline] #0: ffff888029350b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bd/0x3e0 fs/ext4/inode.c:2773 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfaf/0xff0 kernel/hung_task.c:379 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 31453 Comm: kworker/1:2 Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: events_power_efficient wg_ratelimiter_gc_entries RIP: 0010:wg_ratelimiter_gc_entries+0x94/0x470 drivers/net/wireguard/ratelimiter.c:64 Code: 00 00 00 48 8b 1d ec d6 76 0c 48 89 04 24 48 01 c3 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 0f f7 cf fb 4c 8b 23 <4d> 85 e4 0f 84 68 01 00 00 49 83 c4 a0 0f 84 5e 01 00 00 49 8d 6c RSP: 0018:ffffc90007d6fba8 EFLAGS: 00000246 RAX: 1ffff1100b3ce0d0 RBX: ffff888059e70680 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90007d6fb20 RBP: ffffc90007d6fdd0 R08: 0000000000000003 R09: fffff52000fadf64 R10: dffffc0000000000 R11: fffff52000fadf64 R12: 0000000000000000 R13: dffffc0000000000 R14: 000002b80e3484d4 R15: ffffffff8e372640 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeb418b338 CR3: 000000000d730000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2703 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2784 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242