general protection fault, probably for non-canonical address 0xdffffc0040000001: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000200000008-0x000000020000000f] CPU: 1 PID: 4432 Comm: udevd Not tainted 6.3.0-rc2-syzkaller-00235-g8d3c682a5e3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:__hlist_del include/linux/list.h:901 [inline] RIP: 0010:hlist_del include/linux/list.h:913 [inline] RIP: 0010:__alloc_object lib/debugobjects.c:213 [inline] RIP: 0010:alloc_object lib/debugobjects.c:230 [inline] RIP: 0010:__debug_object_init+0x21f/0xf10 lib/debugobjects.c:577 Code: c1 ef 03 80 3c 37 00 0f 85 34 0a 00 00 48 85 c0 48 89 01 74 24 48 8d 78 08 48 be 00 00 00 00 00 fc ff df 49 89 fa 49 c1 ea 03 <41> 80 3c 32 00 0f 85 e4 09 00 00 48 89 48 08 48 b8 00 01 00 00 00 RSP: 0000:ffffc9000341f820 EFLAGS: 00010002 RAX: 0000000200000000 RBX: 00000000000cc078 RCX: ffff8880b9938ca0 RDX: ffff8880b9938ca0 RSI: dffffc0000000000 RDI: 0000000200000008 RBP: ffff88808afdf888 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000040000001 R11: 0000000000000000 R12: 1ffff92000683f12 R13: ffff88807ce009c0 R14: ffffffff92000fc0 R15: ffffffff92000fb8 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4d0e7821b8 CR3: 000000000c571000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_object_init lib/debugobjects.c:624 [inline] debug_object_activate+0x330/0x3e0 lib/debugobjects.c:710 debug_rcu_head_queue kernel/rcu/rcu.h:189 [inline] __call_rcu_common.constprop.0+0x2c/0x7e0 kernel/rcu/tree.c:2607 ep_remove+0x43a/0x9e0 fs/eventpoll.c:733 ep_free+0x238/0x390 fs/eventpoll.c:780 ep_eventpoll_release+0x45/0x60 fs/eventpoll.c:797 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xad3/0x2960 kernel/exit.c:869 do_group_exit+0xd4/0x2a0 kernel/exit.c:1019 get_signal+0x2315/0x25b0 kernel/signal.c:2859 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:309 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7f5ed38c455b Code: Unable to access opcode bytes at 0x7f5ed38c4531. RSP: 002b:00007ffd18c5b758 EFLAGS: 00010206 RAX: 7669727000040048 RBX: 00005625aa5fa370 RCX: 00007f5ed38ff097 RDX: 0000000000008000 RSI: 00007f5ed38fee6d RDI: 00005625aa69d7f0 RBP: 000000000000000d R08: 0000000000000000 R09: 00007f5ed39f5a60 R10: 0000000001000000 R11: 0000000000000293 R12: 00005625aa60d410 R13: 00000000000000ff R14: 00007ffd18c5b770 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__hlist_del include/linux/list.h:901 [inline] RIP: 0010:hlist_del include/linux/list.h:913 [inline] RIP: 0010:__alloc_object lib/debugobjects.c:213 [inline] RIP: 0010:alloc_object lib/debugobjects.c:230 [inline] RIP: 0010:__debug_object_init+0x21f/0xf10 lib/debugobjects.c:577 Code: c1 ef 03 80 3c 37 00 0f 85 34 0a 00 00 48 85 c0 48 89 01 74 24 48 8d 78 08 48 be 00 00 00 00 00 fc ff df 49 89 fa 49 c1 ea 03 <41> 80 3c 32 00 0f 85 e4 09 00 00 48 89 48 08 48 b8 00 01 00 00 00 RSP: 0000:ffffc9000341f820 EFLAGS: 00010002 RAX: 0000000200000000 RBX: 00000000000cc078 RCX: ffff8880b9938ca0 RDX: ffff8880b9938ca0 RSI: dffffc0000000000 RDI: 0000000200000008 RBP: ffff88808afdf888 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000040000001 R11: 0000000000000000 R12: 1ffff92000683f12 R13: ffff88807ce009c0 R14: ffffffff92000fc0 R15: ffffffff92000fb8 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4d0e7821b8 CR3: 000000000c571000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c1 ef 03 shr $0x3,%edi 3: 80 3c 37 00 cmpb $0x0,(%rdi,%rsi,1) 7: 0f 85 34 0a 00 00 jne 0xa41 d: 48 85 c0 test %rax,%rax 10: 48 89 01 mov %rax,(%rcx) 13: 74 24 je 0x39 15: 48 8d 78 08 lea 0x8(%rax),%rdi 19: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi 20: fc ff df 23: 49 89 fa mov %rdi,%r10 26: 49 c1 ea 03 shr $0x3,%r10 * 2a: 41 80 3c 32 00 cmpb $0x0,(%r10,%rsi,1) <-- trapping instruction 2f: 0f 85 e4 09 00 00 jne 0xa19 35: 48 89 48 08 mov %rcx,0x8(%rax) 39: 48 rex.W 3a: b8 00 01 00 00 mov $0x100,%eax