kernel panic: panic_on

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[syzbot] kernel panic: panic_on_warn set (3)	1 (2)	2021/09/10 07:34

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[syzbot] kernel panic: panic_on_warn set (3)

1 (2)

2021/09/10 07:34

Kernel	Title	Repro	Cause bisect	Count	Last	Reported	Patched	Status
upstream	kernel panic: panic_on_warn set (4) kernel	syz	error	2	957d	957d	0/26	closed as invalid on 2021/09/13 11:45
android-54	kernel panic: panic_on_warn set	C		52	1146d	1244d	0/2	auto-obsoleted due to no activity on 2023/04/24 19:54
upstream	kernel panic: panic_on_warn set kernel	syz	error	1	978d	978d	0/26	closed as invalid on 2021/08/23 09:16
upstream	kernel panic: panic_on_warn set (2) io-uring	syz	error	1	960d	960d	0/26	closed as invalid on 2021/09/08 09:41

handle drivers/base/devtmpfs.c:382 [inline] devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline] devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 22 Comm: kdevtmpfs Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 panic+0x2b0/0x6dd kernel/panic.c:232 kfence_report_error.cold+0x304/0xa56 mm/kfence/report.c:264 kfence_handle_page_fault+0x203/0x630 mm/kfence/core.c:880 page_fault_oops+0x1c5/0x6b0 arch/x86/mm/fault.c:686 kernelmode_fixup_or_oops+0x219/0x280 arch/x86/mm/fault.c:755 __bad_area_nosemaphore+0x36d/0x400 arch/x86/mm/fault.c:801 do_kern_addr_fault+0x5b/0x70 arch/x86/mm/fault.c:1200 handle_page_fault arch/x86/mm/fault.c:1473 [inline] exc_page_fault+0x155/0x180 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0010:kvm_fastop_exception+0xf6a/0x1058 Code: d3 ed e9 ef d4 6e f8 49 8d 0e 48 83 e1 f8 4c 8b 21 41 8d 0e 83 e1 07 c1 e1 03 49 d3 ec e9 45 e2 6e f8 49 8d 4d 00 48 83 e1 f8 <4c> 8b 21 41 8d 4d 00 83 e1 07 c1 e1 03 49 d3 ec e9 35 ec 6e f8 bd RSP: 0018:ffffc90000dcfae8 EFLAGS: 00010282 RAX: 0000003361736376 RBX: ffff88806f1e3068 RCX: ffff88823bd14020 RDX: ffffed100de3c614 RSI: 0000000000000005 RDI: 0000000000000007 RBP: 0000000000000005 R08: 0000000000000000 R09: ffff88806f1e3098 R10: ffffed100de3c613 R11: 0000000000000000 R12: ffff88823bd14020 R13: ffff88823bd14020 R14: ffff88806f1e3098 R15: dffffc0000000000 d_lookup+0xd8/0x170 fs/dcache.c:2370 lookup_dcache+0x1e/0x130 fs/namei.c:1520 __lookup_hash+0x29/0x180 fs/namei.c:1543 kern_path_locked+0x17e/0x320 fs/namei.c:2567 handle_remove+0xa2/0x5fe drivers/base/devtmpfs.c:312 handle drivers/base/devtmpfs.c:382 [inline] devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline] devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Kernel Offset: disabled ---------------- Code disassembly (best guess): 0: d3 ed shr %cl,%ebp 2: e9 ef d4 6e f8 jmpq 0xf86ed4f6 7: 49 8d 0e lea (%r14),%rcx a: 48 83 e1 f8 and $0xfffffffffffffff8,%rcx e: 4c 8b 21 mov (%rcx),%r12 11: 41 8d 0e lea (%r14),%ecx 14: 83 e1 07 and $0x7,%ecx 17: c1 e1 03 shl $0x3,%ecx 1a: 49 d3 ec shr %cl,%r12 1d: e9 45 e2 6e f8 jmpq 0xf86ee267 22: 49 8d 4d 00 lea 0x0(%r13),%rcx 26: 48 83 e1 f8 and $0xfffffffffffffff8,%rcx * 2a: 4c 8b 21 mov (%rcx),%r12 <-- trapping instruction 2d: 41 8d 4d 00 lea 0x0(%r13),%ecx 31: 83 e1 07 and $0x7,%ecx 34: c1 e1 03 shl $0x3,%ecx 37: 49 d3 ec shr %cl,%r12 3a: e9 35 ec 6e f8 jmpq 0xf86eec74 3f: bd .byte 0xbd