Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning: ------------[ cut here ]------------ lockdep bfs error:-1 WARNING: CPU: 2 PID: 6472 at kernel/locking/lockdep.c:2062 print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2062 Modules linked in: CPU: 2 UID: 0 PID: 6472 Comm: syz-executor.1 Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2062 Code: 90 55 53 89 fb e8 17 23 41 03 89 c5 e8 00 ff ff ff 85 ed 74 19 83 fb ff 74 1b 90 48 c7 c7 de d9 e0 8d 89 de e8 f8 d6 e2 ff 90 <0f> 0b 90 90 5b 5d e9 3c 2a f3 09 48 c7 c7 98 d5 c6 8d e8 c0 e3 02 RSP: 0018:ffffc90026f47058 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 00000000ffffffff RCX: ffffffff817af1a8 RDX: ffff888029224880 RSI: ffffffff817af1b5 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000037343654 R12: ffffc90026f470d0 R13: ffff8880292253e8 R14: ffff8880292253c0 R15: ffffc90026f47110 FS: 0000555557141480(0000) GS:ffff8880d6913000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555557141da8 CR3: 00000000473b1000 CR4: 0000000000352ef0 Call Trace: check_irq_usage+0x33b/0x920 kernel/locking/lockdep.c:2819 check_prev_add kernel/locking/lockdep.c:3172 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x1285/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline] ktime_get+0x80/0x310 kernel/time/timekeeping.c:776 __hrtimer_start_range_ns kernel/time/hrtimer.c:1256 [inline] hrtimer_start_range_ns+0x27e/0xfc0 kernel/time/hrtimer.c:1329 dequeue_dl_entity kernel/sched/deadline.c:2113 [inline] dl_server_stop+0x40/0x90 kernel/sched/deadline.c:1680 dequeue_entities+0x81e/0x1680 kernel/sched/fair.c:7158 dequeue_task_fair+0x187/0x3b0 kernel/sched/fair.c:7193 block_task kernel/sched/core.c:2149 [inline] try_to_block_task kernel/sched/core.c:6619 [inline] __schedule+0x547/0x5de0 kernel/sched/core.c:6735 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6879 io_schedule+0xbf/0x130 kernel/sched/core.c:7724 migration_entry_wait_on_locked+0x751/0x8c0 mm/filemap.c:1439 migration_entry_wait+0x24f/0x2f0 mm/migrate.c:396 do_swap_page+0x320c/0x65c0 mm/memory.c:4496 handle_pte_fault mm/memory.c:6072 [inline] __handle_mm_fault+0x162f/0x5490 mm/memory.c:6212 handle_mm_fault+0x589/0xd10 mm/memory.c:6381 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:__get_user_8+0x14/0x30 arch/x86/lib/getuser.S:103 Code: ca e9 00 0a 04 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 ba 00 f0 ff ff ff 7f 00 00 48 39 d0 48 0f 47 c2 0f 01 cb <48> 8b 10 31 c0 0f 01 ca e9 cf 09 04 00 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc90026f47df8 EFLAGS: 00050283 RAX: 0000555557141da8 RBX: 0000555557141da8 RCX: ffffc90026f47d9c RDX: 00007ffffffff000 RSI: ffffffff81f28897 RDI: ffffffff8c158f60 RBP: ffffc90026f47ef8 R08: f9f0d9a003d2eb8b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888029224880 R13: ffffc90026f47f58 R14: ffff888029224880 R15: ffffc90026f47e60 rseq_get_rseq_cs_ptr_val kernel/rseq.c:248 [inline] rseq_get_rseq_cs kernel/rseq.c:270 [inline] rseq_ip_fixup kernel/rseq.c:390 [inline] __rseq_handle_notify_resume+0x183/0x10e0 kernel/rseq.c:438 rseq_handle_notify_resume include/linux/rseq.h:38 [inline] resume_user_mode_work include/linux/resume_user_mode.h:62 [inline] exit_to_user_mode_loop+0xcb/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f70bbe7c6c7 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 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:00007ffcee23cd28 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: 0000000000000000 RBX: 0000000000000065 RCX: 00007f70bbe7c6c7 RDX: 0000000000000200 RSI: 00007ffcee23dea0 RDI: 00000000ffffff9c RBP: 00007f70bbec8336 R08: 00005555571429db R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffcee23dea0 R13: 00007f70bbec8336 R14: 0000000000021746 R15: 000000000000000b ---------------- Code disassembly (best guess): 0: ca e9 00 lret $0xe9 3: 0a 04 00 or (%rax,%rax,1),%al 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 48 ba 00 f0 ff ff ff movabs $0x7ffffffff000,%rdx 1d: 7f 00 00 20: 48 39 d0 cmp %rdx,%rax 23: 48 0f 47 c2 cmova %rdx,%rax 27: 0f 01 cb stac * 2a: 48 8b 10 mov (%rax),%rdx <-- trapping instruction 2d: 31 c0 xor %eax,%eax 2f: 0f 01 ca clac 32: e9 cf 09 04 00 jmp 0x40a06 37: 66 data16 38: 66 data16 39: 2e cs 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 84 00 test %al,(%rax)