genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 24080 Comm: syz.1.4138 Not tainted 6.16.0-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813aa528>] lr : [<813aa518>] psr: 60000013 sp : dfaadd30 ip : dfaadd30 fp : dfaadd54 r10: 82b16f00 r9 : 00000003 r8 : 83cc5900 r7 : dfaadd90 r6 : 83cc5900 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15304 r1 : 00000001 r0 : 813aa198 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85b4e7c0 DAC: fffffffd Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 83cc5900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfaac000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2602 Register r8 information: slab kmalloc-192 start 83cc5900 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfaac000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2602 Register r12 information: 2-page vmalloc region starting at 0xdfaac000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2602 Process syz.1.4138 (pid: 24080, stack limit = 0xdfaac000) Stack: (0xdfaadd30 to 0xdfaae000) dd20: 823fde2c 83cc5900 829cf8ec 829cf8ec dd40: 81e157c4 83cc5944 dfaadd8c dfaadd58 813a65c0 813aa3c0 200000c0 00000000 dd60: dfaadd7c 200000c0 83cc5900 b5403587 200000c0 857d0000 40946400 00000003 dd80: dfaade4c dfaadd90 813a2140 813a64c4 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000001f 00010004 00000004 00000003 00000cc7 00000004 ddc0: 00080008 0000000b 00000009 00000002 00000002 fffffffd 00000001 00000006 dde0: 10000103 00000000 00000006 00000003 3fff7fff 00000089 00000081 00000001 de00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 de20: 00000000 ef58390e 00000000 854ed000 83cc5900 200000c0 200000c0 857d0000 de40: dfaadf14 dfaade50 813a310c 813a204c 00000000 00000000 00000000 ef58390e de60: 00000000 00000000 8247054c 0000005f 83c92058 83cc5930 83d168c4 857d0000 de80: dfaadee4 dfaade90 80797b7c 8078dee0 00000064 00000001 00000000 dfaadeac dea0: 85c7eb50 8342c3b8 00006400 0000000b dfaadea0 00000000 00000000 ef58390e dec0: 854ed000 40946400 200000c0 200000c0 854ed000 00000003 dfaadef4 dfaadee8 dee0: 80797c9c ef58390e dfaadf14 40946400 00000000 854ed001 200000c0 854ed000 df00: 00000003 857d0000 dfaadfa4 dfaadf18 8056d1d4 813a2b3c ecac8b10 857d0000 df20: dfaadf3c dfaadf30 81a37d18 81a37be8 dfaadf54 dfaadf40 8025e478 8028ef74 df40: dfaadfb0 40000000 dfaadf84 dfaadf58 802229ec 8025e434 00000000 8281cddc df60: dfaadfb0 0014c750 ecac8b10 80222940 00000000 ef58390e dfaadfac 00000000 df80: 00000000 002f6300 00000036 8020029c 857d0000 00000036 00000000 dfaadfa8 dfa0: 80200060 8056d0b0 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b330bc dfe0: 76b32ec0 76b32eb0 000193dc 001321f0 60000010 00000003 00000000 00000000 Call trace: [<813aa3b4>] (parport_attach) from [<813a65c0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:83cc5944 r5:81e157c4 r4:829cf8ec [<813a64b8>] (comedi_device_attach) from [<813a2140>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:857d0000 r7:200000c0 r6:b5403587 r5:83cc5900 r4:200000c0 [<813a2040>] (do_devconfig_ioctl) from [<813a310c>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:857d0000 r7:200000c0 r6:200000c0 r5:83cc5900 r4:854ed000 [<813a2b30>] (comedi_unlocked_ioctl) from [<8056d1d4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a2b30>] (comedi_unlocked_ioctl) from [<8056d1d4>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a2b30>] (comedi_unlocked_ioctl) from [<8056d1d4>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a2b30>] (comedi_unlocked_ioctl) from [<8056d1d4>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:857d0000 r9:00000003 r8:854ed000 r7:200000c0 r6:854ed001 r5:00000000 r4:40946400 [<8056d0a4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaadfa8 to 0xdfaadff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b330bc dfe0: 76b32ec0 76b32eb0 000193dc 001321f0 r10:00000036 r9:857d0000 r8:8020029c r7:00000036 r6:002f6300 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction