8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2d when write [fee04f2d] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 8476 Comm: syz.2.1152 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 subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<81417544>] lr : [<81417530>] psr: 60000013 sp : df83dcb0 ip : df83dcb0 fp : df83dccc r10: 00000001 r9 : 00000084 r8 : df83dd9c r7 : 00004f2a r6 : 0000009b r5 : 841e3180 r4 : 00004f2d r3 : 0000009b r2 : fee04f2d r1 : 00000001 r0 : 841e3180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85da25c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 841e3180 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 841e3180 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xdf83c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf83c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdf83c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.2.1152 (pid: 8476, stack limit = 0xdf83c000) Stack: (0xdf83dcb0 to 0xdf83e000) dca0: 814174e4 841e3180 00004f2a 00004f2a dcc0: df83dcec df83dcd0 8141721c 814174f0 00004f2a 80515568 8524b000 8524b000 dce0: df83dd0c df83dcf0 814175dc 814171d0 841e3180 00000000 8524b000 00004f2a dd00: df83dd4c df83dd10 81417788 8141755c 8280ca60 844e8780 828215b0 00000000 dd20: 00000000 829d46a0 841e3180 841e31c4 df83dd88 841e3180 00000000 82b28ad8 dd40: df83dd84 df83dd50 814062bc 81417720 841e31b0 00000000 df83dd74 200000c0 dd60: 841e3180 b5403587 841e31b0 85c43c00 40946400 00000003 df83de44 df83dd88 dd80: 81401c14 814061c0 35353238 00000000 00000000 00000000 00000000 00004f2a dda0: 80002002 00010003 0000000b 00000010 00000cc7 fffffffe 0000569b 00000008 ddc0: 00000081 00000005 fffbfffd 00000042 0800004f 00000206 000000fa 00000008 dde0: 0001a449 00000002 40000003 0000008b 0000cae4 00000006 20001e58 00003f4a de00: 00000c69 00002040 00000006 ffffffff 00000000 00000000 00000000 0e8fc6bd de20: 00000000 862da240 841e3180 200000c0 841e31b0 85c43c00 df83df14 df83de48 de40: 81402c08 81401b20 00000000 00000000 00000000 00000000 00000000 0e8fc6bd de60: 00000000 00000000 824a45ec 0000005f 8444c838 00000064 8466cbdc 85c43c00 de80: df83dee4 df83de90 807b8780 807aeca4 00000064 00000001 00000000 df83deac dea0: 85e5a9d0 834276e8 00006400 0000000b df83dea0 00000000 00000000 0e8fc6bd dec0: 862da240 40946400 200000c0 200000c0 862da240 00000003 df83def4 df83dee8 dee0: 807b88a0 0e8fc6bd df83df14 40946400 00000000 862da241 200000c0 862da240 df00: 00000003 85c43c00 df83dfa4 df83df18 80585d10 81402658 ecac8b10 85c43c00 df20: df83df3c df83df30 81ab1724 81ab15f4 df83df54 df83df40 8025bcbc 8028e0c4 df40: df83dfb0 40000000 df83df84 df83df58 80221a38 8025bc78 00000000 8281cf7c df60: df83dfb0 0014c8c0 ecac8b10 8022198c 00000000 0e8fc6bd df83dfac 00000000 df80: 00000000 00326310 00000036 8020029c 85c43c00 00000036 00000000 df83dfa8 dfa0: 80200060 80585bec 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f3c0bc dfe0: 76f3bec0 76f3beb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<814174e4>] (subdev_8255_io) from [<8141721c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f2a r6:00004f2a r5:841e3180 r4:814174e4 [<814171c4>] (subdev_8255_do_config) from [<814175dc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814171c4>] (subdev_8255_do_config) from [<814175dc>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8524b000 [<81417550>] (subdev_8255_io_init) from [<81417788>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81417550>] (subdev_8255_io_init) from [<81417788>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f2a r6:8524b000 r5:00000000 r4:841e3180 [<81417714>] (dev_8255_attach) from [<814062bc>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:841e3180 r7:df83dd88 r6:841e31c4 r5:841e3180 r4:829d46a0 [<814061b4>] (comedi_device_attach) from [<81401c14>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85c43c00 r7:841e31b0 r6:b5403587 r5:841e3180 r4:200000c0 [<81401b14>] (do_devconfig_ioctl) from [<81402c08>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85c43c00 r7:841e31b0 r6:200000c0 r5:841e3180 r4:862da240 [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85c43c00 r9:00000003 r8:862da240 r7:200000c0 r6:862da241 r5:00000000 r4:40946400 [<80585be0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf83dfa8 to 0xdf83dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f3c0bc dfe0: 76f3bec0 76f3beb0 000192bc 00132360 r10:00000036 r9:85c43c00 r8:8020029c r7:00000036 r6:00326310 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction