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: 1 UID: 0 PID: 17359 Comm: syz.0.3546 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 : [<8149bb18>] lr : [<8149bb04>] psr: 60000013 sp : eb451cb8 ip : eb451cb8 fp : eb451cd4 r10: 00000300 r9 : 00000004 r8 : eb451da4 r7 : 00000000 r6 : 0000009b r5 : 8315a600 r4 : 00000303 r3 : 0000009b r2 : fee00303 r1 : 00000001 r0 : 8315a600 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85fa2b00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8315a600 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 8315a600 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 0xeb450000 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 0xeb450000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r12 information: 2-page vmalloc region starting at 0xeb450000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Process syz.0.3546 (pid: 17359, stack limit = 0xeb450000) Stack: (0xeb451cb8 to 0xeb452000) 1ca0: 8149bab8 00000300 1cc0: 8315a600 00000000 eb451cf4 eb451cd8 8149b7f4 8149bac4 00000300 eb451cf8 1ce0: 8149bbac 85d10000 eb451d14 eb451cf8 8149bbac 8149b7a8 8315a600 00000000 1d00: 85d10000 00000000 eb451d54 eb451d18 8149bd5c 8149bb30 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bd95c0 8315a600 00000000 eb451d90 8315a600 1d40: 00000000 82d30df4 eb451d8c eb451d58 8148a700 8149bcf4 40946400 00000000 1d60: eb451d7c 20000440 8315a600 b5403587 40946400 00000001 00000003 85ccd5c0 1d80: eb451e4c eb451d90 81485f04 8148a604 35353238 00000000 00000000 00000000 1da0: 00000000 00000300 00000008 0000fca8 00006432 0000000e 00840005 80000001 1dc0: 00000006 00000006 00000005 feffffff 0000000b 00000001 fffffffc 00000002 1de0: 00000003 00000005 0004007a 00000005 00000003 0000000a 00000012 0100007f 1e00: 00002009 00000005 00000e66 00000001 00006829 0800a6b5 00000000 00000005 1e20: 00000000 49cda2c4 00000000 865cdf00 8315a600 20000440 40946400 00000001 1e40: eb451f14 eb451e50 8148722c 81485e44 eb451e4c 49cda2c4 00000000 00000000 1e60: 8254780c eb451ea4 0000005f 84166408 00000064 8315a630 eb451ee4 eb451e88 1e80: 80803604 807f9934 00000064 00000001 00000000 eb451ea4 84d12d10 834f6f68 1ea0: 00006400 0000000b eb451e98 00000000 eb451d38 49cda2c4 00000000 865cdf00 1ec0: 40946400 20000440 20000440 865cdf00 00000003 85ccd5c0 eb451ef4 eb451ee8 1ee0: 80803738 49cda2c4 eb451f14 00000000 865cdf01 40946400 20000440 865cdf00 1f00: 00000003 85ccd5c0 eb451fa4 eb451f18 805ba698 81486ee4 ecac8b10 85ccd5c0 1f20: eb451f3c eb451f30 81b52020 81b51eec eb451f54 eb451f40 8025a790 8028e468 1f40: eb451fb0 40000000 eb451f84 eb451f58 80220bdc 8025a74c 00000000 82a1eb0c 1f60: eb451fb0 0013e9c0 ecac8b10 80220b30 00000000 49cda2c4 eb451fac 00000000 1f80: 00000000 00346310 00000036 8020029c 85ccd5c0 00000036 00000000 eb451fa8 1fa0: 80200060 805ba460 00000000 00000000 00000003 40946400 20000440 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f660dc 1fe0: 76f65e88 76f65e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149bab8>] (subdev_8255_io) from [<8149b7f4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8315a600 r5:00000300 r4:8149bab8 [<8149b79c>] (subdev_8255_do_config) from [<8149bbac>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149b79c>] (subdev_8255_do_config) from [<8149bbac>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85d10000 [<8149bb24>] (subdev_8255_io_init) from [<8149bd5c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149bb24>] (subdev_8255_io_init) from [<8149bd5c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85d10000 r5:00000000 r4:8315a600 [<8149bce8>] (dev_8255_attach) from [<8148a700>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30df4 r9:00000000 r8:8315a600 r7:eb451d90 r6:00000000 r5:8315a600 r4:82bd95c0 [<8148a5f8>] (comedi_device_attach) from [<81485f04>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:85ccd5c0 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8315a600 r4:20000440 [<81485e38>] (do_devconfig_ioctl) from [<8148722c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000440 r5:8315a600 r4:865cdf00 [<81486ed8>] (comedi_unlocked_ioctl) from [<805ba698>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81486ed8>] (comedi_unlocked_ioctl) from [<805ba698>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81486ed8>] (comedi_unlocked_ioctl) from [<805ba698>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81486ed8>] (comedi_unlocked_ioctl) from [<805ba698>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85ccd5c0 r9:00000003 r8:865cdf00 r7:20000440 r6:40946400 r5:865cdf01 r4:00000000 [<805ba454>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeb451fa8 to 0xeb451ff0) 1fa0: 00000000 00000000 00000003 40946400 20000440 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f660dc 1fe0: 76f65e88 76f65e78 00018ebc 00130820 r10:00000036 r9:85ccd5c0 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