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: 1 UID: 0 PID: 3092 Comm: syz.2.8738 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81432c7c>] lr : [<81432c6c>] psr: 60000013 sp : ea5d9d30 ip : ea5d9d30 fp : ea5d9d54 r10: 82b2efdc r9 : 00000003 r8 : 8339f6c0 r7 : ea5d9d90 r6 : 8339f6c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e24918 r1 : 00000001 r0 : 814328ec Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85f95800 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 8339f6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea5d8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 8339f6c0 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 0xea5d8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xea5d8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.2.8738 (pid: 3092, stack limit = 0xea5d8000) Stack: (0xea5d9d30 to 0xea5da000) 9d20: 8244454c 8339f6c0 829d66c0 829d66c0 9d40: 81e24dd8 00000000 ea5d9d8c ea5d9d58 8142e7f0 81432b14 40946400 00000000 9d60: ea5d9d7c 200000c0 8339f6c0 b5403587 40946400 00000003 00000003 85402400 9d80: ea5d9e4c ea5d9d90 81429ffc 8142e6f0 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 0000001f 00010000 00000004 00000003 00000cc7 00000004 9dc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 9de0: 10000105 00000000 0001a44d 00000003 3fff7fff 0000008a 00000010 00000001 9e00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 ffffffff effffff8 9e20: 00000000 7a91edbe 00000000 85ff5300 8339f6c0 200000c0 40946400 00000003 9e40: ea5d9f14 ea5d9e50 8142b320 81429f34 00000000 7a91edbe 00000000 00000000 9e60: 824b857c ea5d9ea4 0000005f 841f8250 00000064 8339f6f0 ea5d9ee4 ea5d9e88 9e80: 807cf048 807c5420 00000064 00000001 00000000 ea5d9ea4 830ce190 8342c330 9ea0: 00006400 0000000b ea5d9e98 00000000 00000000 7a91edbe 00000000 85ff5300 9ec0: 40946400 200000c0 200000c0 85ff5300 00000003 85402400 ea5d9ef4 ea5d9ee8 9ee0: 807cf178 7a91edbe ea5d9f14 00000000 85ff5301 40946400 200000c0 85ff5300 9f00: 00000003 85402400 ea5d9fa4 ea5d9f18 80590510 8142afd8 ecac8b10 85402400 9f20: ea5d9f3c ea5d9f30 81ae3934 81ae3800 ea5d9f54 ea5d9f40 8025a824 8028c290 9f40: ea5d9fb0 40000000 ea5d9f84 ea5d9f58 80220bf8 8025a7e0 00000000 8281d2bc 9f60: ea5d9fb0 0013e480 ecac8b10 80220b4c 00000000 7a91edbe ea5d9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 85402400 00000036 00000000 ea5d9fa8 9fa0: 80200060 805902d8 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fbe0dc 9fe0: 76fbde88 76fbde78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81432b08>] (parport_attach) from [<8142e7f0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24dd8 r4:829d66c0 [<8142e6e4>] (comedi_device_attach) from [<81429ffc>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:85402400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8339f6c0 r4:200000c0 [<81429f28>] (do_devconfig_ioctl) from [<8142b320>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8339f6c0 r4:85ff5300 [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85402400 r9:00000003 r8:85ff5300 r7:200000c0 r6:40946400 r5:85ff5301 r4:00000000 [<805902cc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea5d9fa8 to 0xea5d9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fbe0dc 9fe0: 76fbde88 76fbde78 00018ba0 001302e0 r10:00000036 r9:85402400 r8:8020029c r7:00000036 r6:00346310 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