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: 11420 Comm: syz.6.1104 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 : [<814087e8>] lr : [<814087d8>] psr: 60000013 sp : e4541d28 ip : e4541d28 fp : e4541d4c r10: 82b28ad8 r9 : 00000003 r8 : 844b4e40 r7 : e4541d88 r6 : 844b4e40 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: 865bbc80 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 844b4e40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe4540000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 844b4e40 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 0xe4540000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe4540000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.6.1104 (pid: 11420, stack limit = 0xe4540000) Stack: (0xe4541d28 to 0xe4542000) 1d20: 82432cec 844b4e40 829d3f08 829d3f08 81e1a7f8 844b4e84 1d40: e4541d84 e4541d50 81404490 81408680 844b4e70 00000000 e4541d74 200000c0 1d60: 844b4e40 b5403587 844b4e70 85e56c00 40946400 00000003 e4541e44 e4541d88 1d80: 813ffde8 81404394 656d6f63 705f6964 6f707261 00007472 00000000 00008001 1da0: 00000019 00000001 00000000 00000002 00000cc7 00000008 00000007 0000000a 1dc0: 00000100 00000002 00000001 00000008 01100004 00000006 00000009 00000001 1de0: 0001a449 00000003 40000003 00000089 00000002 00000f27 00000006 0000800b 1e00: 00000008 00000005 00000008 00000008 00010000 fffffff7 00000000 1e53de82 1e20: 00000000 85b21180 844b4e40 200000c0 844b4e70 85e56c00 e4541f14 e4541e48 1e40: 81400ddc 813ffcf4 00000000 00000000 00000000 00000000 00000000 1e53de82 1e60: 00000000 00000000 824a35ec 0000005f 840b6250 00000064 84610174 85e56c00 1e80: e4541ee4 e4541e90 807b7d30 807ae254 00000064 00000001 00000000 e4541eac 1ea0: 860b1e50 834eb198 00006400 0000000b e4541ea0 00000000 00000000 1e53de82 1ec0: 85b21180 40946400 200000c0 200000c0 85b21180 00000004 e4541ef4 e4541ee8 1ee0: 807b7e50 1e53de82 e4541f14 40946400 00000000 85b21181 200000c0 85b21180 1f00: 00000004 85e56c00 e4541fa4 e4541f18 805854f4 8140082c ecac8b10 85e56c00 1f20: e4541f3c e4541f30 81aaf27c 81aaf14c e4541f54 e4541f40 8025bcbc 8028e07c 1f40: e4541fb0 40000000 e4541f84 e4541f58 80221a38 8025bc78 00000000 8281d17c 1f60: e4541fb0 0014c880 ecac8b10 8022198c 00000000 1e53de82 e4541fac 00000000 1f80: 00000000 00316310 00000036 8020029c 85e56c00 00000036 00000000 e4541fa8 1fa0: 80200060 805853d0 00000000 00000000 00000004 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f3b0bc 1fe0: 76f3aec0 76f3aeb0 0001929c 00132320 60000010 00000004 00000000 00000000 Call trace: [<81408674>] (parport_attach) from [<81404490>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:844b4e84 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 r8:85e56c00 r7:844b4e70 r6:b5403587 r5:844b4e40 r4:200000c0 [<813ffce8>] (do_devconfig_ioctl) from [<81400ddc>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85e56c00 r7:844b4e70 r6:200000c0 r5:844b4e40 r4:85b21180 [<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) r10:85e56c00 r9:00000004 r8:85b21180 r7:200000c0 r6:85b21181 r5:00000000 r4:40946400 [<805853c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe4541fa8 to 0xe4541ff0) 1fa0: 00000000 00000000 00000004 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f3b0bc 1fe0: 76f3aec0 76f3aeb0 0001929c 00132320 r10:00000036 r9:85e56c00 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