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: 20003 Comm: syz.3.3773 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 : [<813ab008>] lr : [<813aaff8>] psr: 60000113 sp : dfa21d30 ip : dfa21d30 fp : dfa21d54 r10: 82b16f00 r9 : 00000003 r8 : 8415fc00 r7 : dfa21d90 r6 : 8415fc00 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15444 r1 : 00000001 r0 : 813aac78 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 859392c0 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 8415fc00 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 8415fc00 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.3.3773 (pid: 20003, stack limit = 0xdfa20000) Stack: (0xdfa21d30 to 0xdfa22000) 1d20: 823fe320 8415fc00 829cf8ec 829cf8ec 1d40: 81e15904 8415fc44 dfa21d8c dfa21d58 813a70a0 813aaea0 200000c0 00000000 1d60: dfa21d7c 200000c0 8415fc00 b5403587 200000c0 84fa9800 40946400 00000003 1d80: dfa21e4c dfa21d90 813a2c20 813a6fa4 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 0000001f 00010000 00000004 00000005 00000cc7 00000008 1dc0: 00000007 0000000a 00000100 00000002 00000001 00000002 00000001 00000006 1de0: 00000101 00000000 0001a449 00000003 40000003 00000089 0000caa7 00000000 1e00: 20001e58 0000000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 1e20: 00000000 fdaf46c7 00000000 859c5a80 8415fc00 200000c0 200000c0 84fa9800 1e40: dfa21f14 dfa21e50 813a3bec 813a2b2c 00000000 00000000 00000000 fdaf46c7 1e60: 00000000 00000000 8247054c 0000005f 83cc9c58 8415fc30 8423db04 84fa9800 1e80: dfa21ee4 dfa21e90 8079795c 8078dcc0 00000064 00000001 00000000 dfa21eac 1ea0: 8480bd90 8351f3b8 00006400 0000000b dfa21ea0 00000000 00000000 fdaf46c7 1ec0: 859c5a80 40946400 200000c0 200000c0 859c5a80 00000004 dfa21ef4 dfa21ee8 1ee0: 80797a7c fdaf46c7 dfa21f14 40946400 00000000 859c5a81 200000c0 859c5a80 1f00: 00000004 84fa9800 dfa21fa4 dfa21f18 8056cf18 813a361c ecac8b10 84fa9800 1f20: dfa21f3c dfa21f30 81a388b8 81a38788 dfa21f54 dfa21f40 8025e490 8028ef8c 1f40: dfa21fb0 40000000 dfa21f84 dfa21f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfa21fb0 0014c820 ecac8b10 80222940 00000000 fdaf46c7 dfa21fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 84fa9800 00000036 00000000 dfa21fa8 1fa0: 80200060 8056cdf4 00000000 00000000 00000004 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fdb0bc 1fe0: 76fdaec0 76fdaeb0 0001948c 001322c0 60000010 00000004 00000000 00000000 Call trace: [<813aae94>] (parport_attach) from [<813a70a0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:8415fc44 r5:81e15904 r4:829cf8ec [<813a6f98>] (comedi_device_attach) from [<813a2c20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84fa9800 r7:200000c0 r6:b5403587 r5:8415fc00 r4:200000c0 [<813a2b20>] (do_devconfig_ioctl) from [<813a3bec>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:84fa9800 r7:200000c0 r6:200000c0 r5:8415fc00 r4:859c5a80 [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84fa9800 r9:00000004 r8:859c5a80 r7:200000c0 r6:859c5a81 r5:00000000 r4:40946400 [<8056cde8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa21fa8 to 0xdfa21ff0) 1fa0: 00000000 00000000 00000004 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fdb0bc 1fe0: 76fdaec0 76fdaeb0 0001948c 001322c0 r10:00000036 r9:84fa9800 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