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syzbot found the following issue on:

HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1714c518580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d033b14aeef39158 dashboard link: https://syzkaller.appspot.com/bug?extid=ab2fd19057fa822e71c6 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144ff6b0580000

Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-... vmlinux: https://storage.googleapis.com/syzbot-assets/a53b888c1f3f/vmlinux-69e858e0.x... kernel image: https://storage.googleapis.com/syzbot-assets/6b5e17edafc0/bzImage-69e858e0.x... mounted in repro: https://storage.googleapis.com/syzbot-assets/d96853f65a99/mount_6.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ab2fd19057fa822e71c6@syzkaller.appspotmail.com

kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffff8880465c3da0 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation PGD 1aa01067 P4D 1aa01067 PUD 1aa04067 PMD 80000000464001e3 Oops: Oops: 0011 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 3089 Comm: kworker/u4:10 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: bat_events batadv_nc_worker RIP: 0010:0xffff8880465c3da0 Code: 00 00 00 00 00 00 00 00 00 00 01 03 06 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a8 3e 5c 46 80 88 ff ff <08> 3e 5c 46 80 88 ff ff b8 6f 54 59 80 88 ff ff 5b 15 00 00 f3 02 RSP: 0018:ffffc90000007b98 EFLAGS: 00010246 RAX: ffffffff81ac83d1 RBX: 0000000000000001 RCX: ffff88803b080000 RDX: 0000000000000100 RSI: ffffffff8c608040 RDI: ffff888059546f28 RBP: ffffc90000007c90 R08: ffffffff81ac83be R09: 1ffffffff203680e R10: dffffc0000000000 R11: ffff8880465c3da0 R12: 1ffff92000000f78 R13: ffff888059546f28 R14: 0000000000000001 R15: 0000000000000100 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880465c3da0 CR3: 0000000054b64000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5855 Code: 2b 00 74 08 4c 89 f7 e8 8a 2b 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc9000db47940 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92001b68f34 RCX: ffff88803b080ae8 RDX: dffffc0000000000 RSI: ffffffff8c0ab8e0 RDI: ffffffff8c608060 RBP: ffffc9000db47aa0 R08: ffffffff942f6847 R09: 1ffffffff285ed08 R10: dffffc0000000000 R11: fffffbfff285ed09 R12: 1ffff92001b68f30 R13: dffffc0000000000 R14: ffffc9000db479a0 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xec/0x610 net/batman-adv/network-coding.c:719 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: CR2: ffff8880465c3da0 ---[ end trace 0000000000000000 ]--- RIP: 0010:0xffff8880465c3da0 Code: 00 00 00 00 00 00 00 00 00 00 01 03 06 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a8 3e 5c 46 80 88 ff ff <08> 3e 5c 46 80 88 ff ff b8 6f 54 59 80 88 ff ff 5b 15 00 00 f3 02 RSP: 0018:ffffc90000007b98 EFLAGS: 00010246 RAX: ffffffff81ac83d1 RBX: 0000000000000001 RCX: ffff88803b080000 RDX: 0000000000000100 RSI: ffffffff8c608040 RDI: ffff888059546f28 RBP: ffffc90000007c90 R08: ffffffff81ac83be R09: 1ffffffff203680e R10: dffffc0000000000 R11: ffff8880465c3da0 R12: 1ffff92000000f78 R13: ffff888059546f28 R14: 0000000000000001 R15: 0000000000000100 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880465c3da0 CR3: 0000000054b64000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 2b 00 sub (%rax),%eax 2: 74 08 je 0xc 4: 4c 89 f7 mov %r14,%rdi 7: e8 8a 2b 8b 00 call 0x8b2b96 c: f6 44 24 61 02 testb $0x2,0x61(%rsp) 11: 0f 85 85 01 00 00 jne 0x19c 17: 41 f7 c7 00 02 00 00 test $0x200,%r15d 1e: 74 01 je 0x21 20: fb sti 21: 48 c7 44 24 40 0e 36 movq $0x45e0360e,0x40(%rsp) 28: e0 45 * 2a: 4b c7 44 25 00 00 00 movq $0x0,0x0(%r13,%r12,1) <-- trapping instruction 31: 00 00 33: 43 c7 44 25 09 00 00 movl $0x0,0x9(%r13,%r12,1) 3a: 00 00 3c: 43 rex.XB 3d: c7 .byte 0xc7 3e: 44 rex.R 3f: 25 .byte 0x25

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