BUG: soft lockup in call_timer

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	BUG: soft lockup in call_timer_fn net mm	1				19	507d	549d	0/29	auto-obsoleted due to no activity on 2024/10/08 10:43
upstream	INFO: rcu detected stall in call_timer_fn (5) net input usb	1	C			9	161d	295d	0/29	upstream: reported C repro on 2025/02/27 04:11
linux-4.19	BUG: soft lockup in call_timer_fn	1	C		error	31	1020d	1623d	0/1	upstream: reported C repro on 2021/07/10 02:48
upstream	INFO: rcu detected stall in call_timer_fn (2) kernel	1	C	done	error	47	1430d	2286d	0/29	closed as invalid on 2022/02/08 10:46
upstream	BUG: soft lockup in call_timer_fn (2) trace	1				1	433d	429d	0/29	auto-obsoleted due to no activity on 2025/01/10 05:15

Dropped {multi|broad}cast of type= [86dd] watchdog: BUG: soft lockup - CPU#1 stuck for 115s! [syz-executor.2:15753] Modules linked in: irq event stamp: 41311997 hardirqs last enabled at (41311996): [<ffffffff86800979>] restore_regs_and_return_to_kernel+0x0/0x27 hardirqs last disabled at (41311997): [<ffffffff86801b01>] apic_timer_interrupt+0x91/0xa0 arch/x86/entry/entry_64.S:792 softirqs last enabled at (18222080): [<ffffffff86a00645>] __do_softirq+0x645/0x9a0 kernel/softirq.c:314 softirqs last disabled at (18227849): [<ffffffff81390620>] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (18227849): [<ffffffff81390620>] irq_exit+0x160/0x1b0 kernel/softirq.c:409 CPU: 1 PID: 15753 Comm: syz-executor.2 Not tainted 4.14.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888094394300 task.stack: ffff88804b270000 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ea/0x430 kernel/locking/lockdep.c:3997 RSP: 0018:ffff8880aed07cf0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fe2d29 RBX: ffff888094394300 RCX: 0000000002a75fde RDX: dffffc0000000000 RSI: ffff888094394bd0 RDI: 0000000000000286 RBP: ffff8880aed07d38 R08: 0000000000006670 R09: ffffffff8959dd40 R10: ffff888094394bd0 R11: ffff888094394300 R12: ffff8880aed07d90 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fe125cd2700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c434a81000 CR3: 000000007ae2e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> call_timer_fn+0x114/0x670 kernel/time/timer.c:1276 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 </IRQ> RIP: 0010:rcu_is_watching+0x7e/0xb0 kernel/rcu/tree.c:1131 RSP: 0018:ffff88804b2776f0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000001 RBX: ffff8880aed23940 RCX: 1ffffffff0f82dad RDX: 0000000000000000 RSI: ffffffff87047d00 RDI: ffff8880aed2394c RBP: ffff88804b277700 R08: 0000000000000000 R09: ffff888094394bc8 R10: ffff888094394ba8 R11: ffff888094394300 R12: ffffea00023bfc80 R13: dead000000000100 R14: ffffffffffffffff R15: ffffea00023bfcb8 rcu_read_unlock include/linux/rcupdate.h:681 [inline] __unlock_page_memcg+0x78/0x100 mm/memcontrol.c:1716 unlock_page_memcg+0x2c/0x40 mm/memcontrol.c:1725 page_remove_file_rmap mm/rmap.c:1245 [inline] page_remove_rmap+0x1c7/0x940 mm/rmap.c:1296 zap_pte_range mm/memory.c:1342 [inline] zap_pmd_range mm/memory.c:1444 [inline] zap_pud_range mm/memory.c:1473 [inline] zap_p4d_range mm/memory.c:1494 [inline] unmap_page_range+0xabd/0x19f0 mm/memory.c:1515 unmap_single_vma+0x15d/0x2c0 mm/memory.c:1560 unmap_vmas+0xac/0x170 mm/memory.c:1590 exit_mmap+0x285/0x4e0 mm/mmap.c:3056 __mmput kernel/fork.c:930 [inline] mmput+0x114/0x440 kernel/fork.c:951 exit_mm kernel/exit.c:545 [inline] do_exit+0x952/0x2cd0 kernel/exit.c:845 do_group_exit+0x111/0x330 kernel/exit.c:955 get_signal+0x381/0x1cd0 kernel/signal.c:2413 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x414ce1 RSP: 002b:00007fe125cd17a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 6666666666666667 RCX: 0000000000414ce1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fe125cd1850 RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fe125cd26d4 R13: 00000000004cc1c7 R14: 00000000004e6f20 R15: 00000000ffffffff Code: 83 7c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 f5 01 00 00 48 83 3d 9a f1 a8 06 00 0f 84 5e 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7382 Comm: kworker/u4:5 Not tainted 4.14.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) task: ffff888055f8c300 task.stack: ffff888055f90000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0xfd/0x370 kernel/smp.c:302 RSP: 0018:ffff888055f96e60 EFLAGS: 00000297 RAX: ffff888055f8c300 RBX: 1ffff1100abf2dd0 RCX: 0000000000000830 RDX: 0000000000000000 RSI: 00000000000000fb RDI: 0000000000000830 RBP: ffff888055f96f08 R08: 0000000000004638 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888055f97010 R14: 0000000000000000 R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd89814f2b8 CR3: 0000000007e6a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many+0x638/0x7c0 kernel/smp.c:434 native_flush_tlb_others+0x81/0x4a0 arch/x86/mm/tlb.c:663 flush_tlb_others arch/x86/include/asm/paravirt.h:309 [inline] flush_tlb_mm_range+0x1ce/0x340 arch/x86/mm/tlb.c:712 flush_tlb_page arch/x86/include/asm/tlbflush.h:573 [inline] ptep_clear_flush+0xe6/0x110 mm/pgtable-generic.c:87 page_mkclean_one+0x267/0x5c0 mm/rmap.c:915 rmap_walk_file+0x38d/0x8b0 mm/rmap.c:1829 rmap_walk+0xed/0x190 mm/rmap.c:1847 page_mkclean+0x162/0x1a0 mm/rmap.c:981 clear_page_dirty_for_io+0x1fb/0x7f0 mm/page-writeback.c:2704 mpage_submit_page+0x77/0x240 fs/ext4/inode.c:2202 mpage_process_page_bufs+0x418/0x510 fs/ext4/inode.c:2332 mpage_prepare_extent_to_map+0x489/0xb20 fs/ext4/inode.c:2704 ext4_writepages+0x105f/0x2fd0 fs/ext4/inode.c:2851 do_writepages+0xd0/0x250 mm/page-writeback.c:2361 __writeback_single_inode+0xe6/0x1120 fs/fs-writeback.c:1367 writeback_sb_inodes+0x4ce/0xeb0 fs/fs-writeback.c:1631 __writeback_inodes_wb+0xc3/0x210 fs/fs-writeback.c:1700 wb_writeback+0x735/0xba0 fs/fs-writeback.c:1809 wb_check_old_data_flush fs/fs-writeback.c:1922 [inline] wb_do_writeback fs/fs-writeback.c:1946 [inline] wb_workfn+0x943/0xf70 fs/fs-writeback.c:1975 process_one_work+0x863/0x1600 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 13 09 00 48 8b 54 24 10 4c 89 e9 8b 7c 24 1c 48 8d 74 24 40 e8 d5 fa ff ff 41 89 c4 8b 44 24 58 a8 01 74 10 e8 55 13 09 00 f3 90 <8b> 54 24 58 83 e2 01 75 f0 e8 45 13 09 00 e8 40 13 09 00 bf 01