8<--- cut here --- Unable to handle kernel paging request at virtual address fee00143 when write [fee00143] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 11733 Comm: syz.4.1945 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 : [<814a1148>] lr : [<814a1134>] psr: 60000013 sp : dfb79cb8 ip : dfb79cb8 fp : dfb79cd4 r10: 00000140 r9 : 00000004 r8 : dfb79da4 r7 : 00000000 r6 : 0000009b r5 : 8315b3c0 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 8315b3c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 862f5180 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8315b3c0 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 8315b3c0 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 0xdfb78000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfb78000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfb78000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.4.1945 (pid: 11733, stack limit = 0xdfb78000) Stack: (0xdfb79cb8 to 0xdfb7a000) 9ca0: 814a10e8 00000140 9cc0: 8315b3c0 00000000 dfb79cf4 dfb79cd8 814a0e24 814a10f4 00000140 80546334 9ce0: 853d0000 853d0000 dfb79d14 dfb79cf8 814a11dc 814a0dd8 8315b3c0 00000000 9d00: 853d0000 00000000 dfb79d54 dfb79d18 814a138c 814a1160 ffffffff 00000004 9d20: 82a22dc0 00000000 00000000 82bd965c 8315b3c0 00000000 dfb79d90 8315b3c0 9d40: 00000000 82d30dfc dfb79d8c dfb79d58 8148fd30 814a1324 40946400 00000000 9d60: dfb79d7c 200003c0 8315b3c0 b5403587 40946400 00000003 00000003 8475ee40 9d80: dfb79e4c dfb79d90 8148b534 8148fc34 35353238 00000000 00000000 00000000 9da0: 00000000 00000140 00000002 00000003 00000002 00000002 00000001 00008002 9dc0: 00001000 00001007 0000c72d 00000008 ffffffff 00002009 00000008 000004ce 9de0: fffffffe 000000fc 000000ed 00000007 00000008 00000004 00000000 00000036 9e00: 0004000b 00000ffe 00200000 000000af 00000000 00000009 00000001 00000004 9e20: 00000000 c0f5cb91 00000000 85743e80 8315b3c0 200003c0 40946400 00000003 9e40: dfb79f14 dfb79e50 8148c85c 8148b474 00000000 c0f5cb91 00000000 00000000 9e60: 8254980c dfb79ea4 0000005f 84782058 00000064 8315b3f0 dfb79ee4 dfb79e88 9e80: 808061a4 807fc85c 00000064 00000001 00000000 dfb79ea4 83e51810 83432660 9ea0: 00006400 0000000b dfb79e98 00000000 00000000 c0f5cb91 00000000 85743e80 9ec0: 40946400 200003c0 200003c0 85743e80 00000003 8475ee40 dfb79ef4 dfb79ee8 9ee0: 808062d8 c0f5cb91 dfb79f14 00000000 85743e81 40946400 200003c0 85743e80 9f00: 00000003 8475ee40 dfb79fa4 dfb79f18 805bae48 8148c514 ecac8b10 8475ee40 9f20: dfb79f3c dfb79f30 81b59920 81b597ec dfb79f54 dfb79f40 8025a7a8 8028e490 9f40: dfb79fb0 40000000 dfb79f84 dfb79f58 80220bdc 8025a764 00000000 82a1eb0c 9f60: dfb79fb0 0013ea70 ecac8b10 80220b30 00000000 c0f5cb91 dfb79fac 00000000 9f80: 00000000 00356310 00000036 8020029c 8475ee40 00000036 00000000 dfb79fa8 9fa0: 80200060 805bac10 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f740dc 9fe0: 76f73e88 76f73e78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<814a10e8>] (subdev_8255_io) from [<814a0e24>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8315b3c0 r5:00000140 r4:814a10e8 [<814a0dcc>] (subdev_8255_do_config) from [<814a11dc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a0dcc>] (subdev_8255_do_config) from [<814a11dc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:853d0000 [<814a1154>] (subdev_8255_io_init) from [<814a138c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a1154>] (subdev_8255_io_init) from [<814a138c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:853d0000 r5:00000000 r4:8315b3c0 [<814a1318>] (dev_8255_attach) from [<8148fd30>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8315b3c0 r7:dfb79d90 r6:00000000 r5:8315b3c0 r4:82bd965c [<8148fc28>] (comedi_device_attach) from [<8148b534>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8475ee40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8315b3c0 r4:200003c0 [<8148b468>] (do_devconfig_ioctl) from [<8148c85c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200003c0 r5:8315b3c0 r4:85743e80 [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8475ee40 r9:00000003 r8:85743e80 r7:200003c0 r6:40946400 r5:85743e81 r4:00000000 [<805bac04>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb79fa8 to 0xdfb79ff0) 9fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f740dc 9fe0: 76f73e88 76f73e78 00018ebc 001308d0 r10:00000036 r9:8475ee40 r8:8020029c r7:00000036 r6:00356310 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