genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00800 when write [fee00800] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 12984 Comm: syz.4.2136 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 : [<814012a4>] lr : [<81401294>] psr: 60000113 sp : e0169d30 ip : e0169d30 fp : e0169d54 r10: 82b28b30 r9 : 00000003 r8 : 8451dd80 r7 : e0169d90 r6 : 8451dd80 r5 : 00000000 r4 : 00000000 r3 : fee00800 r2 : 81e24f44 r1 : 00000001 r0 : 81400f14 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86786bc0 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 8451dd80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0168000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8451dd80 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 0xe0168000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe0168000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.4.2136 (pid: 12984, stack limit = 0xe0168000) Stack: (0xe0169d30 to 0xe016a000) 9d20: 8243d12c 8451dd80 829d3948 829d3948 9d40: 81e25404 00000000 e0169d8c e0169d58 813fced0 8140113c 40946400 00000000 9d60: e0169d7c 20000300 8451dd80 b5403587 40946400 83ef2400 00000003 8451ddb0 9d80: e0169e4c e0169d90 813f8800 813fcdd0 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000800 0000001f 00010000 00000004 00000003 00000cc7 00000004 9dc0: 00000010 0000000e 00000006 00000002 00000002 00000007 00000001 00000006 9de0: 10000105 00000000 0001244d 00000003 3fff7fff 00000089 00000010 00000001 9e00: 20001e58 0080000b 00000e6c 00000008 00000008 00000006 ffffffff effffff8 9e20: 00000000 b3d6fce0 00000000 84fbf540 8451dd80 20000300 40946400 83ef2400 9e40: e0169f14 e0169e50 813f9380 813f8738 00000000 b3d6fce0 00000000 00000000 9e60: 824b15ec e0169ea4 0000005f 8329c250 00000064 845c0b4c e0169ee4 e0169e88 9e80: 807b404c 807aa6c8 00000064 00000001 00000000 e0169ea4 85f83550 83419bb0 9ea0: 00006400 0000000b e0169e98 00000000 00000000 b3d6fce0 00000000 84fbf540 9ec0: 40946400 20000300 20000300 84fbf540 00000003 83ef2400 e0169ef4 e0169ee8 9ee0: 807b417c b3d6fce0 e0169f14 00000000 84fbf541 40946400 20000300 84fbf540 9f00: 00000003 83ef2400 e0169fa4 e0169f18 8058223c 813f9288 ecac8b10 83ef2400 9f20: e0169f3c e0169f30 81aa6d78 81aa6c48 e0169f54 e0169f40 8025ba7c 8028ef68 9f40: e0169fb0 40000000 e0169f84 e0169f58 80221a54 8025ba38 00000000 8281cf7c 9f60: e0169fb0 0013ddc0 ecac8b10 802219a8 00000000 b3d6fce0 e0169fac 00000000 9f80: 00000000 00346450 00000036 8020029c 83ef2400 00000036 00000000 e0169fa8 9fa0: 80200060 80582004 00000000 00000000 00000003 40946400 20000300 00000000 9fc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f280dc 9fe0: 76f27e88 76f27e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401130>] (parport_attach) from [<813fced0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d3948 [<813fcdc4>] (comedi_device_attach) from [<813f8800>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8451ddb0 r9:00000003 r8:83ef2400 r7:40946400 r6:b5403587 r5:8451dd80 r4:20000300 [<813f872c>] (do_devconfig_ioctl) from [<813f9380>] (comedi_unlocked_ioctl+0x104/0x1c88 drivers/comedi/comedi_fops.c:2240) r8:83ef2400 r7:40946400 r6:20000300 r5:8451dd80 r4:84fbf540 [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:83ef2400 r9:00000003 r8:84fbf540 r7:20000300 r6:40946400 r5:84fbf541 r4:00000000 [<80581ff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0169fa8 to 0xe0169ff0) 9fa0: 00000000 00000000 00000003 40946400 20000300 00000000 9fc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f280dc 9fe0: 76f27e88 76f27e78 00018734 0012fc20 r10:00000036 r9:83ef2400 r8:8020029c r7:00000036 r6:00346450 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