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: 6466 Comm: syz.0.725 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 : [<81408d38>] lr : [<81408d28>] psr: 60000013 sp : dfca9d28 ip : dfca9d28 fp : dfca9d4c r10: 82b28ad8 r9 : 00000003 r8 : 844a29c0 r7 : dfca9d88 r6 : 844a29c0 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e1a2b8 r1 : 00000001 r0 : 814089a8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8616ac40 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 844a29c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfca8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 844a29c0 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 0xdfca8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfca8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.725 (pid: 6466, stack limit = 0xdfca8000) Stack: (0xdfca9d28 to 0xdfcaa000) 9d20: 82432e8c 844a29c0 dfca9d50 829d3f08 81e1a778 844a2a04 9d40: dfca9d84 dfca9d50 814049e0 81408bd0 b5403587 00000000 854dbc00 200000c0 9d60: 844a29c0 b5403587 844a29f0 854dbc00 40946400 00000003 dfca9e44 dfca9d88 9d80: 81400338 814048e4 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 29e3ef2a 9e20: 00000003 84bac000 844a29c0 200000c0 844a29f0 854dbc00 dfca9f14 dfca9e48 9e40: 8140132c 81400244 854dc388 00000000 8280c9e4 85f6d400 00000000 00000004 9e60: 81c01bac 00000000 00000002 0000005f 84632c28 00000064 dfca9eac 29e3ef2a 9e80: 8029045c 00000000 854dbc00 ffffffff dfca9efc 80200c04 854dbc00 854dbc00 9ea0: dfca9ec4 dfca9eb0 81ab3c38 8028e0c4 81400d70 a0000013 dfca9fa4 dfca9ec8 9ec0: 80200c24 81ab3bf8 84bac000 40946400 200000c0 81400d70 40946400 00000000 9ee0: 84bac001 29e3ef2a 84bac000 40946400 00000000 84bac001 200000c0 84bac000 9f00: 00000004 854dbc00 dfca9fa4 dfca9f18 80585608 81400d7c ecac8b10 854dbc00 9f20: dfca9f3c dfca9f30 81aaf9ac 81aaf87c dfca9f54 dfca9f40 8025bcbc 8028e0c4 9f40: dfca9fb0 40000000 dfca9f84 dfca9f58 80221a38 8025bc78 00000000 8281d17c 9f60: dfca9fb0 0014c8c0 ecac8b10 8022198c 00000000 29e3ef2a dfca9fac 00000000 9f80: 00000000 00326310 00000036 8020029c 854dbc00 00000036 00000000 dfca9fa8 9fa0: 80200060 805854e4 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f040bc 9fe0: 76f03ec0 76f03eb0 000192bc 00132360 60000010 00000004 00000000 00000000 Call trace: [<81408bc4>] (parport_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:844a2a04 r5:81e1a778 r4:829d3f08 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:854dbc00 r7:844a29f0 r6:b5403587 r5:844a29c0 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:854dbc00 r7:844a29f0 r6:200000c0 r5:844a29c0 r4:84bac000 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:854dbc00 r9:00000004 r8:84bac000 r7:200000c0 r6:84bac001 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfca9fa8 to 0xdfca9ff0) 9fa0: 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f040bc 9fe0: 76f03ec0 76f03eb0 000192bc 00132360 r10:00000036 r9:854dbc00 r8:8020029c r7:00000036 r6:00326310 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