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: 4694 Comm: syz.7.6775 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 : [<81488da8>] lr : [<81488d94>] psr: 60000113 sp : eaa3dcb8 ip : eaa3dcb8 fp : eaa3dcd4 r10: 00000300 r9 : 00000004 r8 : eaa3dda4 r7 : 00000000 r6 : 0000009b r5 : 8315bcc0 r4 : 00000303 r3 : 0000009b r2 : fee00303 r1 : 00000001 r0 : 8315bcc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 9a1fa500 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8315bcc0 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 8315bcc0 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 0xeaa3c000 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 0xeaa3c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r12 information: 2-page vmalloc region starting at 0xeaa3c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Process syz.7.6775 (pid: 4694, stack limit = 0xeaa3c000) Stack: (0xeaa3dcb8 to 0xeaa3e000) dca0: 81488d48 00000300 dcc0: 8315bcc0 00000000 eaa3dcf4 eaa3dcd8 81488a84 81488d54 00000300 80544fbc dce0: 910ce800 910ce800 eaa3dd14 eaa3dcf8 81488e3c 81488a38 8315bcc0 00000000 dd00: 910ce800 00000000 eaa3dd54 eaa3dd18 81488fec 81488dc0 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd6d00 8315bcc0 00000000 eaa3dd90 8315bcc0 dd40: 00000000 82d2c9f4 eaa3dd8c eaa3dd58 81477990 81488f84 40946400 00000000 dd60: eaa3dd7c 20000440 8315bcc0 b5403587 40946400 00000001 00000003 8486a4c0 dd80: eaa3de4c eaa3dd90 81473194 81477894 35353238 00000000 00000000 00000000 dda0: 00000000 00000300 80000100 00000002 00001400 0000000e 00840005 00000006 ddc0: 00000006 00000006 00000000 feffffff 00000001 00000001 fffffffc 00040002 dde0: 00000003 00000005 0004007a 00000003 00000003 10000089 00000012 0000007f de00: 00000003 00000005 00000e66 00000001 00000003 0000a6b5 00000000 00000005 de20: 00000000 45824692 00000000 869fb480 8315bcc0 20000440 40946400 00000001 de40: eaa3df14 eaa3de50 814744bc 814730d4 eaa3de4c 45824692 00000000 00000000 de60: 8254080c eaa3dea4 0000005f 8460eb68 00000064 8315bcf0 eaa3dee4 eaa3de88 de80: 80802f1c 807f924c 00000064 00000001 00000000 eaa3dea4 86582210 83435440 dea0: 00006400 0000000b eaa3de98 00000000 eaa3dd38 45824692 00000000 869fb480 dec0: 40946400 20000440 20000440 869fb480 00000003 8486a4c0 eaa3def4 eaa3dee8 dee0: 80803050 45824692 eaa3df14 00000000 869fb481 40946400 20000440 869fb480 df00: 00000003 8486a4c0 eaa3dfa4 eaa3df18 805b9fb0 81474174 ecac8b10 8486a4c0 df20: eaa3df3c eaa3df30 81b3e900 81b3e7cc eaa3df54 eaa3df40 8025a790 8028e468 df40: eaa3dfb0 40000000 eaa3df84 eaa3df58 80220bdc 8025a74c 00000000 82a1eb0c df60: eaa3dfb0 0013e9c0 ecac8b10 80220b30 00000000 45824692 eaa3dfac 00000000 df80: 00000000 00346310 00000036 8020029c 8486a4c0 00000036 00000000 eaa3dfa8 dfa0: 80200060 805b9d78 00000000 00000000 00000003 40946400 20000440 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f660dc dfe0: 76f65e88 76f65e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81488d48>] (subdev_8255_io) from [<81488a84>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8315bcc0 r5:00000300 r4:81488d48 [<81488a2c>] (subdev_8255_do_config) from [<81488e3c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81488a2c>] (subdev_8255_do_config) from [<81488e3c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:910ce800 [<81488db4>] (subdev_8255_io_init) from [<81488fec>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81488db4>] (subdev_8255_io_init) from [<81488fec>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:910ce800 r5:00000000 r4:8315bcc0 [<81488f78>] (dev_8255_attach) from [<81477990>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2c9f4 r9:00000000 r8:8315bcc0 r7:eaa3dd90 r6:00000000 r5:8315bcc0 r4:82bd6d00 [<81477888>] (comedi_device_attach) from [<81473194>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8486a4c0 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8315bcc0 r4:20000440 [<814730c8>] (do_devconfig_ioctl) from [<814744bc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000440 r5:8315bcc0 r4:869fb480 [<81474168>] (comedi_unlocked_ioctl) from [<805b9fb0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81474168>] (comedi_unlocked_ioctl) from [<805b9fb0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81474168>] (comedi_unlocked_ioctl) from [<805b9fb0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81474168>] (comedi_unlocked_ioctl) from [<805b9fb0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8486a4c0 r9:00000003 r8:869fb480 r7:20000440 r6:40946400 r5:869fb481 r4:00000000 [<805b9d6c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeaa3dfa8 to 0xeaa3dff0) dfa0: 00000000 00000000 00000003 40946400 20000440 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f660dc dfe0: 76f65e88 76f65e78 00018ebc 00130820 r10:00000036 r9:8486a4c0 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