watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.6:8294] Modules linked in: irq event stamp: 4820665 hardirqs last enabled at (4820664): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (4820665): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1106 softirqs last enabled at (4811242): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (4811245): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 8294 Comm: syz-executor.6 Not tainted 5.10.238 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:193 Code: ff ff b9 ff ff ff ff b8 08 00 00 00 4d 8b 17 49 8b 16 48 0f bd c8 48 63 c9 e9 5e ff ff ff 4c 01 d2 49 89 17 e9 cd fd ff ff 90 <48> 8b 34 24 65 48 8b 14 25 80 6f 02 00 65 8b 05 5c 9f c1 7e a9 00 RSP: 0018:ffff88806ce09e30 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff813126b7 RDX: ffff888038149a40 RSI: ffffffff8131488b RDI: ffff88803814a370 RBP: ffff8880206758e0 R08: 0000000000000001 R09: ffffffff8686e727 R10: 00000000061a8000 R11: 0000000000000001 R12: ffff88806ce2ea40 R13: ffff88806ce2ecc0 R14: ffff888038149a40 R15: dffffc0000000000 FS: 00007f1e50337700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ed21000 CR3: 0000000049854000 CR4: 0000000000350ef0 Call Trace: trace_hrtimer_expire_exit include/trace/events/timer.h:283 [inline] __run_hrtimer kernel/time/hrtimer.c:1591 [inline] __hrtimer_run_queues+0x1e0/0xb40 kernel/time/hrtimer.c:1652 hrtimer_run_softirq+0x148/0x310 kernel/time/hrtimer.c:1669 __do_softirq+0x1b8/0x7c9 kernel/softirq.c:298 asm_call_irq_on_stack+0x12/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x114/0x1b0 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x43/0xa0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:list_empty_careful include/linux/list.h:319 [inline] RIP: 0010:dd_has_work+0x17b/0x280 block/mq-deadline.c:590 Code: e8 ea 96 56 ff 49 8d 5c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 85 de 00 00 00 49 8b 6c 24 10 <48> 39 eb 75 86 e8 bb 96 56 ff 49 8d 7c 24 18 48 b8 00 00 00 00 00 RSP: 0018:ffff88803e0df510 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff888009294610 RCX: ffffc90004200000 RDX: 1ffff110012528c2 RSI: ffffffff81ea38e6 RDI: ffff8880092946e8 RBP: ffff888009294610 R08: 0000000000000000 R09: ffff88800bf87267 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888009294600 R13: 0000000000000000 R14: ffff88800bf87148 R15: ffff88800bf87040 blk_mq_sched_has_work block/blk-mq-sched.h:75 [inline] blk_mq_hctx_has_pending block/blk-mq.c:74 [inline] blk_mq_run_hw_queue+0x270/0x2f0 block/blk-mq.c:1664 blk_mq_submit_bio+0xfe4/0x1890 block/blk-mq.c:2230 __submit_bio_noacct_mq block/blk-core.c:1020 [inline] submit_bio_noacct+0xc64/0x1010 block/blk-core.c:1053 submit_bio+0xf3/0x4e0 block/blk-core.c:1123 submit_bh_wbc.constprop.0+0x580/0x780 fs/buffer.c:3054 jbd2_write_superblock+0x371/0x8a0 fs/jbd2/journal.c:1601 jbd2_journal_update_sb_log_tail+0x193/0x260 fs/jbd2/journal.c:1646 __jbd2_update_log_tail+0x55/0x390 fs/jbd2/journal.c:1124 jbd2_cleanup_journal_tail+0x12d/0x1f0 fs/jbd2/checkpoint.c:376 jbd2_log_do_checkpoint+0x4c1/0xa00 fs/jbd2/checkpoint.c:330 jbd2_journal_flush+0x14b/0x530 fs/jbd2/journal.c:2303 __ext4_ioctl+0x2cd9/0x4190 fs/ext4/ioctl.c:949 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 RIP: 0033:0x7f1e52dc1b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1e50337188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1e52ed4f60 RCX: 00007f1e52dc1b19 RDX: 00000000200004c0 RSI: 0000000040086607 RDI: 0000000000000005 RBP: 00007f1e52e1bf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd803fd5af R14: 00007f1e50337300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xe/0x20 arch/x86/kernel/process.c:711 EXT4-fs warning (device sda): ext4_group_extend:1805: can't shrink FS - resize aborted cgroup: fork rejected by pids controller in /syz7 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: b9 ff ff ff ff mov $0xffffffff,%ecx 5: b8 08 00 00 00 mov $0x8,%eax a: 4d 8b 17 mov (%r15),%r10 d: 49 8b 16 mov (%r14),%rdx 10: 48 0f bd c8 bsr %rax,%rcx 14: 48 63 c9 movslq %ecx,%rcx 17: e9 5e ff ff ff jmpq 0xffffff7a 1c: 4c 01 d2 add %r10,%rdx 1f: 49 89 17 mov %rdx,(%r15) 22: e9 cd fd ff ff jmpq 0xfffffdf4 27: 90 nop * 28: 48 8b 34 24 mov (%rsp),%rsi <-- trapping instruction 2c: 65 48 8b 14 25 80 6f mov %gs:0x26f80,%rdx 33: 02 00 35: 65 8b 05 5c 9f c1 7e mov %gs:0x7ec19f5c(%rip),%eax # 0x7ec19f98 3c: a9 .byte 0xa9