8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=80000080004003, *pmd=00000000 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 17139 Comm: kworker/u5:1 Not tainted 6.6.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express Workqueue: events_unbound io_ring_exit_work PC is at __io_remove_buffers io_uring/kbuf.c:219 [inline] PC is at __io_remove_buffers+0x38/0x184 io_uring/kbuf.c:209 LR is at io_destroy_buffers+0xa0/0x138 io_uring/kbuf.c:269 pc : [<807c96e4>] lr : [<807c9cf8>] psr: 20000113 sp : ec679e48 ip : ec679e78 fp : ec679e74 r10: 827e4712 r9 : 8448f000 r8 : ffffffff r7 : 8448f34c r6 : 00000001 r5 : 89cfa1c0 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 89cfa1c0 r0 : 8448f000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 846261c0 DAC: fffffffd Register r0 information: slab kmalloc-2k start 8448f000 pointer offset 0 size 2048 Register r1 information: slab kmalloc-64 start 89cfa1c0 pointer offset 0 size 64 Register r2 information: NULL pointer Register r3 information: NULL pointer Register r4 information: NULL pointer Register r5 information: slab kmalloc-64 start 89cfa1c0 pointer offset 0 size 64 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 8448f000 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 8448f000 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xec678000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xec678000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u5:1 (pid: 17139, stack limit = 0xec678000) Stack: (0xec679e48 to 0xec67a000) 9e40: 00000000 89cfa1c0 8448f000 8448f0bc 8448f34c 82604d40 9e60: 8448f3cc 827e4712 ec679e9c ec679e78 807c9cf8 807c96b8 0000fffe b28ae6da 9e80: 8448f3bc 8448f000 8448f040 8448f34c ec679f04 ec679ea0 81826728 807c9c64 9ea0: ec679ebc ec679eb0 0002c5ce 8448f000 00000000 ec679ec0 00000000 81825258 9ec0: 00000000 00000000 ec679ec8 ec679ec8 8448f000 b28ae6da ec679f48 888f3b80 9ee0: 8448f3bc 82c21400 82c0f000 00000140 88842340 82c21405 ec679f44 ec679f08 9f00: 80265fd4 8182638c ec679f2c ec679f18 ec679f44 ec679f20 8026196c 888f3b80 9f20: 888f3bac 82c0f000 82604d40 82c0f020 88842340 61c88647 ec679f84 ec679f48 9f40: 80266520 80265e44 ec679f64 ec679f58 81847e08 80278e68 ec679f84 889b6bc0 9f60: 88842340 802662e0 888f3b80 8350c680 e0689e98 00000000 ec679fac ec679f88 9f80: 8026d8e0 802662ec 889b6bc0 8026d7dc 00000000 00000000 00000000 00000000 9fa0: 00000000 ec679fb0 80200104 8026d7e8 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 Backtrace: [<807c96ac>] (__io_remove_buffers) from [<807c9cf8>] (io_destroy_buffers+0xa0/0x138 io_uring/kbuf.c:269) r10:827e4712 r9:8448f3cc r8:82604d40 r7:8448f34c r6:8448f0bc r5:8448f000 r4:89cfa1c0 r3:00000000 [<807c9c58>] (io_destroy_buffers) from [<81826728>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9c58>] (io_destroy_buffers) from [<81826728>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:8448f34c r6:8448f040 r5:8448f000 r4:8448f3bc [<81826380>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21405 r9:88842340 r8:00000140 r7:82c0f000 r6:82c21400 r5:8448f3bc r4:888f3b80 [<80265e38>] (process_one_work) from [<80266520>] (process_scheduled_works kernel/workqueue.c:2703 [inline]) [<80265e38>] (process_one_work) from [<80266520>] (worker_thread+0x240/0x48c kernel/workqueue.c:2784) r10:61c88647 r9:88842340 r8:82c0f020 r7:82604d40 r6:82c0f000 r5:888f3bac r4:888f3b80 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:e0689e98 r8:8350c680 r7:888f3b80 r6:802662e0 r5:88842340 r4:889b6bc0 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xec679fb0 to 0xec679ff8) 9fa0: 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026d7dc r4:889b6bc0 Code: 0a000022 e5913004 e1d120be e5d14013 (e1d380be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 0a000022 beq 0x90 4: e5913004 ldr r3, [r1, #4] 8: e1d120be ldrh r2, [r1, #14] c: e5d14013 ldrb r4, [r1, #19] * 10: e1d380be ldrh r8, [r3, #14] <-- trapping instruction