genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00003 when write [fee00003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4040 Comm: syz.1.49 Not tainted 6.17.0-rc1-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 : [<813ab4f0>] lr : [<813ab4e0>] psr: 60000013 sp : dfa21d30 ip : dfa21d30 fp : dfa21d54 r10: 82b16f00 r9 : 00000003 r8 : 8411b300 r7 : dfa21d90 r6 : 8411b300 r5 : 00000000 r4 : 00000000 r3 : fee00003 r2 : 81e15464 r1 : 00000001 r0 : 813ab160 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 859a4400 DAC: 00000000 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 8411b300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa20000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 8411b300 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 0xdfa20000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa20000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.49 (pid: 4040, stack limit = 0xdfa20000) Stack: (0xdfa21d30 to 0xdfa22000) 1d20: 823fe3b4 8411b300 829cf92c 829cf92c 1d40: 81e15924 8411b344 dfa21d8c dfa21d58 813a7588 813ab388 200000c0 00000000 1d60: dfa21d7c 200000c0 8411b300 b5403587 200000c0 838b3c00 40946400 00000003 1d80: dfa21e4c dfa21d90 813a3108 813a748c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000003 0000001f 00010000 00000004 00000002 00000cc7 00000004 1dc0: 00080008 0000000e 00000006 00000337 04000001 00000001 00000001 00000006 1de0: 10000105 00000001 00000006 00000003 3fff7fff 00000089 00000010 00000001 1e00: 00000008 0080000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 1e20: 00000000 b6c9e23b 00000000 84875600 8411b300 200000c0 200000c0 838b3c00 1e40: dfa21f14 dfa21e50 813a40d4 813a3014 00000000 00000000 00000000 b6c9e23b 1e60: 00000000 00000000 8247054c 0000005f 83c61c58 8411b330 84145e1c 838b3c00 1e80: dfa21ee4 dfa21e90 8079782c 8078db90 00000064 00000001 00000000 dfa21eac 1ea0: 8496f550 834d25d8 00006400 0000000b dfa21ea0 00000000 00000000 b6c9e23b 1ec0: 84875600 40946400 200000c0 200000c0 84875600 00000003 dfa21ef4 dfa21ee8 1ee0: 8079794c b6c9e23b dfa21f14 40946400 00000000 84875601 200000c0 84875600 1f00: 00000003 838b3c00 dfa21fa4 dfa21f18 8056ce00 813a3b04 ecac8b10 838b3c00 1f20: dfa21f3c dfa21f30 81a39338 81a39208 dfa21f54 dfa21f40 8025e490 8028ef8c 1f40: dfa21fb0 40000000 dfa21f84 dfa21f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfa21fb0 0014c820 ecac8b10 80222940 00000000 b6c9e23b dfa21fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 838b3c00 00000036 00000000 dfa21fa8 1fa0: 80200060 8056ccdc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f820bc 1fe0: 76f81ec0 76f81eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab37c>] (parport_attach) from [<813a7588>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:8411b344 r5:81e15924 r4:829cf92c [<813a7480>] (comedi_device_attach) from [<813a3108>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:838b3c00 r7:200000c0 r6:b5403587 r5:8411b300 r4:200000c0 [<813a3008>] (do_devconfig_ioctl) from [<813a40d4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:838b3c00 r7:200000c0 r6:200000c0 r5:8411b300 r4:84875600 [<813a3af8>] (comedi_unlocked_ioctl) from [<8056ce00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3af8>] (comedi_unlocked_ioctl) from [<8056ce00>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3af8>] (comedi_unlocked_ioctl) from [<8056ce00>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3af8>] (comedi_unlocked_ioctl) from [<8056ce00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:838b3c00 r9:00000003 r8:84875600 r7:200000c0 r6:84875601 r5:00000000 r4:40946400 [<8056ccd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa21fa8 to 0xdfa21ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f820bc 1fe0: 76f81ec0 76f81eb0 0001948c 001322c0 r10:00000036 r9:838b3c00 r8:8020029c r7:00000036 r6:002f6308 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