genirq: Flags mismatch irq 25. 00200004 (comedi_parport) vs. 00215204 (timer) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 6902 Comm: syz.3.663 Not tainted 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 : [<814087e8>] lr : [<814087d8>] psr: 600f0013 sp : dfb09d28 ip : dfb09d28 fp : dfb09d4c r10: 82b28ad8 r9 : 00000003 r8 : 84437c00 r7 : dfb09d88 r6 : 84437c00 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e1a338 r1 : 00000001 r0 : 81408458 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84c06880 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 84437c00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84437c00 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 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.3.663 (pid: 6902, stack limit = 0xdfb08000) Stack: (0xdfb09d28 to 0xdfb0a000) 9d20: 82432d2c 84437c00 829d3f08 829d3f08 81e1a7f8 84437c44 9d40: dfb09d84 dfb09d50 81404490 81408680 84437c30 00000000 dfb09d74 200000c0 9d60: 84437c00 b5403587 84437c30 855e6000 40946400 00000003 dfb09e44 dfb09d88 9d80: 813ffde8 81404394 656d6f63 705f6964 6f707261 00007472 00000000 00008001 9da0: 00000019 00000001 00000000 00000002 00000cc7 00000008 00000007 0000000a 9dc0: 00000100 00000002 00000001 00000008 01100004 00000006 00000009 00000001 9de0: 0001a449 00000003 40000003 00000089 00000002 00000f27 00000006 0000800b 9e00: 00000008 00000005 00000008 00000008 00010000 fffffff7 00000000 b172063e 9e20: 00000000 854640c0 84437c00 200000c0 84437c30 855e6000 dfb09f14 dfb09e48 9e40: 81400ddc 813ffcf4 00000000 00000000 00000000 00000000 00000000 b172063e 9e60: 00000000 00000000 824a35ec 0000005f 845f2448 00000064 8445e87c 855e6000 9e80: dfb09ee4 dfb09e90 807b7d30 807ae254 00000064 00000001 00000000 dfb09eac 9ea0: 851689d0 834de550 00006400 0000000b dfb09ea0 00000000 00000000 b172063e 9ec0: 854640c0 40946400 200000c0 200000c0 854640c0 00000004 dfb09ef4 dfb09ee8 9ee0: 807b7e50 b172063e dfb09f14 40946400 00000000 854640c1 200000c0 854640c0 9f00: 00000004 855e6000 dfb09fa4 dfb09f18 805854f4 8140082c ecac8b10 855e6000 9f20: dfb09f3c dfb09f30 81aaf29c 81aaf16c dfb09f54 dfb09f40 8025bcbc 8028e07c 9f40: dfb09fb0 40000000 dfb09f84 dfb09f58 80221a38 8025bc78 00000000 8281d17c 9f60: dfb09fb0 0014c880 ecac8b10 8022198c 00000000 b172063e dfb09fac 00000000 9f80: 00000000 00316310 00000036 8020029c 855e6000 00000036 00000000 dfb09fa8 9fa0: 80200060 805853d0 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f6a0bc 9fe0: 76f69ec0 76f69eb0 0001929c 00132320 60000010 00000004 00000000 00000000 Call trace: [<81408674>] (parport_attach) from [<81404490>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84437c44 r5:81e1a7f8 r4:829d3f08 [<81404388>] (comedi_device_attach) from [<813ffde8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:855e6000 r7:84437c30 r6:b5403587 r5:84437c00 r4:200000c0 [<813ffce8>] (do_devconfig_ioctl) from [<81400ddc>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:855e6000 r7:84437c30 r6:200000c0 r5:84437c00 r4:854640c0 [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:855e6000 r9:00000004 r8:854640c0 r7:200000c0 r6:854640c1 r5:00000000 r4:40946400 [<805853c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb09fa8 to 0xdfb09ff0) 9fa0: 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f6a0bc 9fe0: 76f69ec0 76f69eb0 0001929c 00132320 r10:00000036 r9:855e6000 r8:8020029c r7:00000036 r6:00316310 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