8<--- cut here --- Unable to handle kernel paging request at virtual address fee00303 when write [fee00303] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 8967 Comm: syz.8.530 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:99 [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 : [<8149c1f8>] lr : [<8149c1e4>] psr: 60000013 sp : dfb4dcb8 ip : dfb4dcb8 fp : dfb4dcd4 r10: 00000300 r9 : 00000004 r8 : dfb4dda4 r7 : 00000000 r6 : 0000009b r5 : 8301a000 r4 : 00000303 r3 : 0000009b r2 : fee00303 r1 : 00000001 r0 : 8301a000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 852c1740 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301a000 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8301a000 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xdfb4c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfb4c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r12 information: 2-page vmalloc region starting at 0xdfb4c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Process syz.8.530 (pid: 8967, stack limit = 0xdfb4c000) Stack: (0xdfb4dcb8 to 0xdfb4e000) dca0: 8149c198 00000300 dcc0: 8301a000 00000000 dfb4dcf4 dfb4dcd8 8149bed4 8149c1a4 00000300 80545ea0 dce0: 85209000 85209000 dfb4dd14 dfb4dcf8 8149c28c 8149be88 8301a000 00000000 dd00: 85209000 00000000 dfb4dd54 dfb4dd18 8149c43c 8149c210 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd9600 8301a000 00000000 dfb4dd90 8301a000 dd40: 00000000 82d30dfc dfb4dd8c dfb4dd58 8148ade0 8149c3d4 40946400 00000000 dd60: dfb4dd7c 20000440 8301a000 b5403587 40946400 00000001 00000003 84699880 dd80: dfb4de4c dfb4dd90 814865e4 8148ace4 35353238 00000000 00000000 00000000 dda0: 00000000 00000300 00000008 0000fca8 00006432 0000000e 00840006 7ffffffe ddc0: 00000006 08000006 00000005 feffffff 0000ca8b 00000001 fffffffc 00000002 dde0: 00000003 00000005 0004007a 00000005 00007fff 0000000a 00000344 0eb0cab5 de00: 00000001 00000085 00000e66 00000001 00000003 0800a6b5 00000000 00000005 de20: 00000000 acaf2041 00000000 86ae3480 8301a000 20000440 40946400 00000001 de40: dfb4df14 dfb4de50 8148790c 81486524 00000000 acaf2041 00000000 00000000 de60: 8254880c dfb4dea4 0000005f 842130f0 00000064 8301a030 dfb4dee4 dfb4de88 de80: 80803694 807f99c4 00000064 00000001 00000000 dfb4dea4 85fdd910 834ecc38 dea0: 00006400 0000000b dfb4de98 00000000 00000000 acaf2041 00000000 86ae3480 dec0: 40946400 20000440 20000440 86ae3480 00000003 84699880 dfb4def4 dfb4dee8 dee0: 808037c8 acaf2041 dfb4df14 00000000 86ae3481 40946400 20000440 86ae3480 df00: 00000003 84699880 dfb4dfa4 dfb4df18 805ba740 814875c4 ecac8b10 84699880 df20: dfb4df3c dfb4df30 81b52720 81b525ec dfb4df54 dfb4df40 8025a79c 8028e478 df40: dfb4dfb0 40000000 dfb4df84 dfb4df58 80220bdc 8025a758 00000000 82a1eb0c df60: dfb4dfb0 0013e9c0 ecac8b10 80220b30 00000000 acaf2041 dfb4dfac 00000000 df80: 00000000 00346310 00000036 8020029c 84699880 00000036 00000000 dfb4dfa8 dfa0: 80200060 805ba508 00000000 00000000 00000003 40946400 20000440 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa20dc dfe0: 76fa1e88 76fa1e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149c198>] (subdev_8255_io) from [<8149bed4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301a000 r5:00000300 r4:8149c198 [<8149be7c>] (subdev_8255_do_config) from [<8149c28c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149be7c>] (subdev_8255_do_config) from [<8149c28c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85209000 [<8149c204>] (subdev_8255_io_init) from [<8149c43c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149c204>] (subdev_8255_io_init) from [<8149c43c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85209000 r5:00000000 r4:8301a000 [<8149c3c8>] (dev_8255_attach) from [<8148ade0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8301a000 r7:dfb4dd90 r6:00000000 r5:8301a000 r4:82bd9600 [<8148acd8>] (comedi_device_attach) from [<814865e4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84699880 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8301a000 r4:20000440 [<81486518>] (do_devconfig_ioctl) from [<8148790c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000440 r5:8301a000 r4:86ae3480 [<814875b8>] (comedi_unlocked_ioctl) from [<805ba740>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814875b8>] (comedi_unlocked_ioctl) from [<805ba740>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814875b8>] (comedi_unlocked_ioctl) from [<805ba740>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814875b8>] (comedi_unlocked_ioctl) from [<805ba740>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84699880 r9:00000003 r8:86ae3480 r7:20000440 r6:40946400 r5:86ae3481 r4:00000000 [<805ba4fc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb4dfa8 to 0xdfb4dff0) dfa0: 00000000 00000000 00000003 40946400 20000440 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa20dc dfe0: 76fa1e88 76fa1e78 00018ebc 00130820 r10:00000036 r9:84699880 r8:8020029c r7:00000036 r6:00346310 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