loop2: detected capacity change from 0 to 64 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3469 at fs/buffer.c:1081 mark_buffer_dirty+0x19c/0x368 fs/buffer.c:1081 Modules linked in: CPU: 1 PID: 3469 Comm: syz-executor247 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mark_buffer_dirty+0x19c/0x368 fs/buffer.c:1081 lr : mark_buffer_dirty+0x19c/0x368 fs/buffer.c:1081 sp : ffff800012a439b0 x29: ffff800012a439b0 x28: ffff0000ccf3eb00 x27: ffff0000cdf87000 x26: ffff0000ced1ff18 x25: ffff0000cec82738 x24: 0000000000000022 x23: 0000000000000021 x22: 000000000000000b x21: ffff0000c0580018 x20: 0000000000000010 x19: ffff0000ced1ff18 x18: fffffffffffffff5 x17: ffff80000dd0b198 x16: ffff80000db49158 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: ff8080000863360c x10: 0000000000000000 x9 : ffff80000863360c x8 : ffff0000cdda3500 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff0000d124cc00 x4 : ffff0000ce451600 x3 : ffff0000d124cb80 x2 : fffffffffffffff0 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: mark_buffer_dirty+0x19c/0x368 fs/buffer.c:1081 bfs_move_block fs/bfs/file.c:43 [inline] bfs_move_blocks fs/bfs/file.c:56 [inline] bfs_get_block+0x2b0/0x434 fs/bfs/file.c:125 __block_write_begin_int+0x240/0x95c fs/buffer.c:2006 __block_write_begin fs/buffer.c:2056 [inline] block_write_begin+0x74/0x14c fs/buffer.c:2117 bfs_write_begin+0x48/0xb8 fs/bfs/file.c:177 generic_perform_write+0xf0/0x2cc mm/filemap.c:3738 __generic_file_write_iter+0xd8/0x21c mm/filemap.c:3866 generic_file_write_iter+0x6c/0x168 mm/filemap.c:3898 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x2dc/0x46c fs/read_write.c:578 ksys_write+0xb4/0x160 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __arm64_sys_write+0x24/0x34 fs/read_write.c:640 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 2114 hardirqs last enabled at (2113): [] bh_lru_install+0x1e0/0x320 fs/buffer.c:1258 hardirqs last disabled at (2114): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (1940): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1938): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010ce8d000 [0000000000000028] pgd=080000010ced9003, p4d=080000010ced9003, pud=080000010b331003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 3469 Comm: syz-executor247 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : bfs_move_block fs/bfs/file.c:42 [inline] pc : bfs_move_blocks fs/bfs/file.c:56 [inline] pc : bfs_get_block+0x29c/0x434 fs/bfs/file.c:125 lr : sb_getblk include/linux/buffer_head.h:363 [inline] lr : bfs_move_block fs/bfs/file.c:41 [inline] lr : bfs_move_blocks fs/bfs/file.c:56 [inline] lr : bfs_get_block+0x298/0x434 fs/bfs/file.c:125 sp : ffff800012a439e0 x29: ffff800012a43a00 x28: ffff0000ccf3eb00 x27: ffff0000cdf87000 x26: 0000000000000000 x25: ffff0000caa4e3f0 x24: 0000000000000022 x23: 0000000000000021 x22: 000000000000001e x21: ffff0000c0580018 x20: ffff0000cdf87000 x19: ffff0000ced1fd20 x18: fffffffffffffff5 x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000cdda3500 x14: 0000000000000050 x13: 00000000ffffffff x12: ffff0000cdda3500 x11: ff808000086353cc x10: 0000000000000000 x9 : ffff8000086353cc x8 : ffff0000cdda3500 x7 : ffff80000863f9b8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000200 x2 : 0000000000000040 x1 : 0000000000000003 x0 : 0000000000000000 Call trace: sb_getblk include/linux/buffer_head.h:363 [inline] bfs_move_block fs/bfs/file.c:41 [inline] bfs_move_blocks fs/bfs/file.c:56 [inline] bfs_get_block+0x29c/0x434 fs/bfs/file.c:125 __block_write_begin_int+0x240/0x95c fs/buffer.c:2006 __block_write_begin fs/buffer.c:2056 [inline] block_write_begin+0x74/0x14c fs/buffer.c:2117 bfs_write_begin+0x48/0xb8 fs/bfs/file.c:177 generic_perform_write+0xf0/0x2cc mm/filemap.c:3738 __generic_file_write_iter+0xd8/0x21c mm/filemap.c:3866 generic_file_write_iter+0x6c/0x168 mm/filemap.c:3898 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x2dc/0x46c fs/read_write.c:578 ksys_write+0xb4/0x160 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __arm64_sys_write+0x24/0x34 fs/read_write.c:640 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: 8b160301 52800103 97f5b6e2 aa0003fa (f9401400) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 8b160301 add x1, x24, x22 4: 52800103 mov w3, #0x8 // #8 8: 97f5b6e2 bl 0xffffffffffd6db90 c: aa0003fa mov x26, x0 * 10: f9401400 ldr x0, [x0, #40] <-- trapping instruction