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authorUladzislau Rezki (Sony) <urezki@gmail.com>2024-03-23 15:15:44 +0100
committerAndrew Morton <akpm@linux-foundation.org>2024-04-05 11:21:30 -0700
commit4ed91fa9177b236b73a271f11a333a98f076eb63 (patch)
treea4d0616ae96039a988065ab851ee1b118141885e
parent8434f9aa6b7e77bc1459d75d1293c3f55bf4687b (diff)
mm: vmalloc: bail out early in find_vmap_area() if vmap is not init
During the boot the s390 system triggers "spinlock bad magic" messages if the spinlock debugging is enabled: [ 0.465445] BUG: spinlock bad magic on CPU#0, swapper/0 [ 0.465490] lock: single+0x1860/0x1958, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0 [ 0.466067] CPU: 0 PID: 0 Comm: swapper Not tainted 6.8.0-12955-g8e938e398669 #1 [ 0.466188] Hardware name: QEMU 8561 QEMU (KVM/Linux) [ 0.466270] Call Trace: [ 0.466470] [<00000000011f26c8>] dump_stack_lvl+0x98/0xd8 [ 0.466516] [<00000000001dcc6a>] do_raw_spin_lock+0x8a/0x108 [ 0.466545] [<000000000042146c>] find_vmap_area+0x6c/0x108 [ 0.466572] [<000000000042175a>] find_vm_area+0x22/0x40 [ 0.466597] [<000000000012f152>] __set_memory+0x132/0x150 [ 0.466624] [<0000000001cc0398>] vmem_map_init+0x40/0x118 [ 0.466651] [<0000000001cc0092>] paging_init+0x22/0x68 [ 0.466677] [<0000000001cbbed2>] setup_arch+0x52a/0x708 [ 0.466702] [<0000000001cb6140>] start_kernel+0x80/0x5c8 [ 0.466727] [<0000000000100036>] startup_continue+0x36/0x40 it happens because such system tries to access some vmap areas whereas the vmalloc initialization is not even yet done: [ 0.465490] lock: single+0x1860/0x1958, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0 [ 0.466067] CPU: 0 PID: 0 Comm: swapper Not tainted 6.8.0-12955-g8e938e398669 #1 [ 0.466188] Hardware name: QEMU 8561 QEMU (KVM/Linux) [ 0.466270] Call Trace: [ 0.466470] dump_stack_lvl (lib/dump_stack.c:117) [ 0.466516] do_raw_spin_lock (kernel/locking/spinlock_debug.c:87 kernel/locking/spinlock_debug.c:115) [ 0.466545] find_vmap_area (mm/vmalloc.c:1059 mm/vmalloc.c:2364) [ 0.466572] find_vm_area (mm/vmalloc.c:3150) [ 0.466597] __set_memory (arch/s390/mm/pageattr.c:360 arch/s390/mm/pageattr.c:393) [ 0.466624] vmem_map_init (./arch/s390/include/asm/set_memory.h:55 arch/s390/mm/vmem.c:660) [ 0.466651] paging_init (arch/s390/mm/init.c:97) [ 0.466677] setup_arch (arch/s390/kernel/setup.c:972) [ 0.466702] start_kernel (init/main.c:899) [ 0.466727] startup_continue (arch/s390/kernel/head64.S:35) [ 0.466811] INFO: lockdep is turned off. ... [ 0.718250] vmalloc init - busy lock init 0000000002871860 [ 0.718328] vmalloc init - busy lock init 00000000028731b8 Some background. It worked before because the lock that is in question was statically defined and initialized. As of now, the locks and data structures are initialized in the vmalloc_init() function. To address that issue add the check whether the "vmap_initialized" variable is set, if not find_vmap_area() bails out on entry returning NULL. Link: https://lkml.kernel.org/r/20240323141544.4150-1-urezki@gmail.com Fixes: 72210662c5a2 ("mm: vmalloc: offload free_vmap_area_lock lock") Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Tested-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Baoquan He <bhe@redhat.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sony.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--mm/vmalloc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 22aa63f4ef63..0d77d171b5d9 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2343,6 +2343,9 @@ struct vmap_area *find_vmap_area(unsigned long addr)
struct vmap_area *va;
int i, j;
+ if (unlikely(!vmap_initialized))
+ return NULL;
+
/*
* An addr_to_node_id(addr) converts an address to a node index
* where a VA is located. If VA spans several zones and passed